# HamAntCal > Amateur radio antenna length calculator for dipoles, verticals, and inverted vees. (iPhone/iPad app by State Road 41 Apps LLC.) - Source: https://appshunter.io/ios/app/hamantcal/id539373704 (this page in markdown: same URL + `.md`) - Developer: [State Road 41 Apps LLC](https://appshunter.io/developer/986230800) - Category: Utilities - Price: $0.99 with in-app purchases - Rating: 4.60/5 from 57 App Store ratings · 60 written reviews indexed - Age rating: 4+ - Requires: iOS 13.0 · 2 MB - Languages: American English - Released: 2012-07-05 - Data updated: 2026-09-08 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/hamantcal/id539373704/reviews.md ## What is HamAntCal? HamAntCal Version 3.5 (Ham Antenna Calculator) will simply and intuitively calculate for you the starting length needed for constructing your antennas in feet/inches or in metric. It will calculate the starting length for "Dipole's", "Inverted Vee's", "Vertical's" and has a page for calculating 1/8, 1/4, 1/2, 5/8 and "Full Wave" length. In this update: ▪HamAntCal has been updated to 64 bit and iPhone X ▪New updated interface and settings menu ▪New in app purchase to update features ▪This update requires iOS 8.2 and above. --------------------------------------- ▪ HamAntCal works in feet/inches as well as metric. ▪ The easy to use and intuitive interface makes it easy to calculate starting lengths for building your antennas. It will calculate the starting length for "Dipoles", "Verticals" and "Inverted Vee" antennas. There is also a page for calculating 1/8, 1/4, 1/2, 5/8 and "Full Wave" length. ▪ I have come across a lot of different and conflicting information for calculating the length of an "Inverted Vee" antenna. Some say subtract 2 to 5 percent based on the angle of the wires. Others say to add a percentage based on the angle of the wires down from horizontal. I decided to test this before releasing this app. First I calculated for a "Dipole" using the "Dipole" calculator. Then I put together a "Dipole" with a support for the center insulator as well as the ends. I measured the resonant frequency with an antenna analyzer. Then I brought the ends down towards 45 degrees from horizontal. As the ends were lowered the resonant frequency increased. This means that the length of the "Inverted Vee" would need to be increased to stay resonant at the same frequency as the dipole. The "Inverted Vee" calculator has a slider that starts up with an angle of 45 degrees and can be adjusted down to 20 degrees continuously re-calculating as it is moved. This corresponds to about 4.5 to 2 percent added to the length of the "Inverted Vee". ▪ No antenna calculator can give exact results in every case. Much will depend on the wire used, the height above ground, the ground itself, nearby objects, etc…. It's always a good practice to add a little extra wire and then trim up to the desired frequency. ▪ This calculator will calculate from 30 Khz to 500Mhz for the "Dipole", "Vertical" and "Length" calculators. The maximum for the "Inverted Vee" calculator is 60MHz. ▪ This calculator does not give exact measurements and the results will need to be trimmed using an antenna analyzer or SWR meter to the exact frequency after installation. Leave some extra wire on each section for trimming and wrapping around the insulators. ▪ Keep in mind that there are a lot of factors that can affect the resonant frequency of an antenna. At VHF and above even a small change in the length or diameter of an element can make a large change in the resonant frequency of an antenna even more so than at lower frequencies. This calculator just provides the starting length for building an antenna and proper matching methods will need to be used. ▪ Please be safe while building your antennas. Always use the proper safety equipment. Never build your antenna where it can come in contact with power lines, this includes the supports as well as the antenna itself and feed lines. BE SAFE! ▪ Although I have had good results using this calculator the results are not guaranteed. Always add some extra length and trim the antenna to frequency (it's much easier to trim than it is to add wire to the antenna). Please feel free to contact me with suggestions, problems, compliments, ideas for improvements or additions to HamAntCal. Your ratings are appreciated. ## Key features - Calculate antenna starting lengths - Supports feet/inches and metric units - Calculates for Dipoles, Inverted Vee, and Verticals - Adjustable Inverted Vee angle calculation - Frequency range 30 KHz to 500 MHz (Inverted Vee up to 60 MHz) - Updated interface and settings ## Pricing and in-app purchases Base price: $0.99. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Features upgrade | $0.99 | one-time | ## What do users think of HamAntCal? Overall sentiment: positive **Pros** - 👍 Easy to use - 🚀 Quick calculations - 💡 Visually clear concepts - 👍 Great tool for ham radio - 👍 Useful for field use - 👍 Handy for quick calculations - 👍 Great free reference app - 👍 Appreciated for years of use - 👍 Great for basic antenna building - 👍 Simple and easy to use - 👍 Handy to have - 👍 Saves time and brain cells - 👍 Great starting point for antenna work - 👍 Quick and to the point - 👍 Useful little app - 👍 Convenient for those who forget formulas - 👍 Excellent for Field Day - 👍 Helpful for building antennas - 👍 Fantastic, exactly what was needed - 👍 Works well with all antenna types - 👍 Great for students learning amateur radio - 👍 Saves a lot of time experimenting - 👍 Awesome tool for trying different wires - 👍 Very handy - 👍 Fast one-stop shop for calculations - 👍 Good starting point - 👍 Saves paper, does math for you - 👍 Fast and accurate - 👍 Easy and fun to use - 👍 Simplicity rules - 👍 Works for me **Cons** - 🤔 Lacks visual aids/pictures - 🤔 Limited to basic calculations - 🐛 Not working with iOS 11 (historical) - 🐛 Needs UHF & above support - 🐛 Incorrect calculation for inverted V - 🐛 Rudimentary, lacks advanced features - 🐛 Limited, cannot calculate high frequencies - 🐛 Inverted V calculation issue - 🐛 UI could be improved **Commonly reported bugs** - No longer works with IOS 11 (historical) - App is wrong on inverted V - Inverted V issue: leg length calculation seems incorrect - Calculation for inverted V seems incorrect **Most requested features** - Add support for UHF frequencies and higher - Add velocity factor and radiating element size as variables - Add suggestion: input target and measured frequency to show trim/add amount - Add Inverted Vee mode to calculate height to top and end-to-end distance - Add trap calculations for common bands - Add full wave loop calculation - Improve UI: one page for frequency entry, browse antenna options with more room for info - Add 5/8 wave vertical calculation - Show how to build a yagi antenna - Add metric units ## Recent user reviews (10 of 60) All indexed reviews: https://appshunter.io/ios/app/hamantcal/id539373704/reviews.md ### 5/5 — Easy in the field *2025-05-24* This app is very easy to use and very quick. We enjoy using it in the field to make last-minute calculations to modify antennas and to update existing ones ### 2/5 — Average *2023-12-29, version 3.5* I thought this would show me pictures, give me materials to use. I can do length calculations on my phones calculator. ### 5/5 — Much Thanks *2022-02-03* This app has been so useful to me for years now. . It is easy to understand because the developers made the concepts visually clear! ### 4/5 — No longer works with IOS 11 *2017-12-24* This used to be a great app. But it has not been updated in awhile. This version will not work with IOS 11 until updated. This has since been updated, it is once again a great app. Thanks so much **Developer response:** HamAntCal has been updated this weekend for the iPhone X and iOS 11 ### 5/5 — Great tool for ham radio! *2017-12-11, version 3.1* love this app and will continue to use it! ### 3/5 — Needs UHF & above *2017-12-11, version 3.1* Please add support for UHF frequencies and higher. ### 5/5 — Can you PLEASE update this Great APP? *2017-11-25* I want to thank you so much for the Great FREE reference APP that i have used playing out in the field portable, and for quick calculations when pre-planning different dipoles on the go, and at the home QTH Antenna Farm!! I Really appreciated the use of this APP, can you please update it, because it win’t work on the iOS 11. Update😐thanks a lot apple🙁 Yes i was real dumb not to support it with buying the full version! I am sorry! Thank You for the Years of Great Use!! KG4JXH-Daniel **Developer response:** Thanks for the kind words and the rating. HamAntCal has been updated this weekend. I think you will like the new look and features. ### 5/5 — Waiting for iOS-11 update *2017-11-07* Great free app. Needs to be updated to work on iOS-11. When can we expect this? ### 5/5 — Update Please *2017-10-15* This app was a 5, but is now a 1 since I can’t use it anymore. Please update it to work with the latest iPhone update! Thanks! **Developer response:** HamAntCal is now updated and ready to go for iOS 11 ### 5/5 — K9JDP *2016-11-30, version 2.0* Great app use it all the time 👍 ## Frequently asked questions about HamAntCal ### What does HamAntCal do? HamAntCal is a mobile application designed for amateur radio operators to calculate the starting lengths needed for constructing various types of antennas. It supports common antenna designs like dipoles, inverted vees, and verticals, and can also calculate specific fractional wave lengths. ### What types of antennas can I calculate with this app? The app allows you to calculate starting lengths for 'Dipole' antennas, 'Inverted Vee' antennas, and 'Vertical' antennas. It also features a dedicated page for calculating 1/8, 1/4, 1/2, 5/8, and 'Full Wave' lengths. ### How does the Inverted Vee calculation work? The Inverted Vee calculator includes a slider that allows you to adjust the angle of the wires from horizontal, starting at 45 degrees and going down to 20 degrees. As you adjust the angle, the calculator continuously re-calculates the required length, accounting for the change in wire angle. ### Does the app provide exact antenna measurements? No antenna calculator can provide exact results in every situation, as factors like wire type, height above ground, and nearby objects influence performance. The app provides starting lengths, and it is recommended to add extra wire and trim to the desired frequency using an antenna analyzer or SWR meter after installation. ### What are the system requirements for HamAntCal? This update requires iOS 8.2 and above. The app has been updated to 64-bit and is compatible with iPhone X. There is also an in-app purchase available to unlock additional features. ## Version history (last 4 releases) ### 3.5 — 2020-06-29 General updates for IOS 13 and interface cleanup. ### 3.1 — 2017-12-09 Updated for 64 bit and iPhone X. New updated interface. New settings menu. In app purchase to add new features to HamAntCal. Requires iOS 8.2 and above. ### 2.0 — 2013-02-16 In this update: ▪ HamAntCal has been updated to take advantage of the larger screen size of the the new iphone5 ▪ HamAntCal now has metric as well as feet/inches Metric can be set as the default in the iPhone settings menu (go to the iPhone settings menu scroll down and look for HamAntCal) ▪ Able to switch between feet/inches and metric output on any page ▪ Enter frequency on any antenna type and have it carry over to all other antenna types ("global frequency disabled" set to "OFF" in the settings menu) ▪ Enter different frequency for each antenna type (global frequency disabled set to "ON" in the settings menu) ▪ Click sounds have been added for keypad entry and auto calculation (able to turn sounds ON and OFF in the settings menu) ### 1.0 — 2012-07-05 No release notes. ## Apps similar to HamAntCal | App | Rating | Price | Category | | --- | --- | --- | --- | | [Construction Calculator](https://appshunter.io/ios/app/construction-calculator/id1092417398) | 4.7 (625) | Free | Utilities | | [Feet and Inches Calculator](https://appshunter.io/ios/app/feet-and-inches-calculator/id1072241945) | 4.6 (409) | Free | Utilities | | [Ohms Law Calc.](https://appshunter.io/ios/app/ohms-law-calc/id491898006) | 4.7 (1,326) | Free | Utilities | | [E-Calc USA](https://appshunter.io/ios/app/e-calc-usa/id6502258186) | 5.0 (1) | $14.99 | Utilities | | [iConcreteCalculator](https://appshunter.io/ios/app/iconcretecalculator/id1327788667) | 5.0 (2) | $1.99 | Utilities | | [Duct Calculator](https://appshunter.io/ios/app/duct-calculator/id1078238132) | 4.5 (189) | $19.99 | Utilities | ## More apps by State Road 41 Apps LLC - [HamAntCal+](https://appshunter.io/ios/app/hamantcal-plus/id1069262620) All apps by State Road 41 Apps LLC: https://appshunter.io/developer/986230800 ## Related topics [antenna calculator](https://appshunter.io/ios/topics/antenna-calculator) · [hf beam antenna calculator](https://appshunter.io/ios/topics/hf-beam-antenna-calculator) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-08.*