# HamAntCal+

> Amateur radio antenna length calculator for dipoles, inverted vees, and verticals. (iPhone/iPad app by State Road 41 Apps LLC.)

- Source: https://appshunter.io/ios/app/hamantcal-plus/id1069262620 (this page in markdown: same URL + `.md`)
- Developer: [State Road 41 Apps LLC](https://appshunter.io/developer/986230800)
- Category: Utilities
- Price: $1.99
- Rating: 4.40/5 from 8 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 2 MB
- Languages: American English
- Released: 2016-01-04
- Data updated: 2026-09-06
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/hamantcal-plus/id1069262620/reviews.md

## What is HamAntCal+?

HamAntCalplus Version 1.5.5 (Ham Antenna Calculator Plus) 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.

HamAntCalplus is designed to work on the iPad as well as the iPhone.

In this update:

▪Updated for iPhone X.

▪Updated “Inverted Vee” with slider for height of the ends above ground.

▪This update requires iOS 8.2 and above.

  -------------------------------------

▪      Will calculate to feet/inches, feet with a decimal point or inches only below 10 ft if desired as well as metric.
 
▪      Just swipe to the left to access up to 6 saved antenna calculations for each antenna type.

▪      You can calculate for the length of an antenna in free space.

▪      Enter a high and a low frequency in a band and calculate for a frequency centered between the 2 frequencies entered.

▪      A diameter slider lets you enter antenna element diameters up to 1” to adjust for antenna element length based on the diameter of the element.

▪      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 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 HamAntCalplus. Your ratings are appreciated.

## Key features

- Calculate antenna lengths in feet/inches or metric
- Supports Dipole, Inverted Vee, and Vertical antennas
- Adjust calculations for antenna element diameter
- Save up to 6 antenna calculations
- Calculate for free space or centered frequency
- Inverted Vee calculator with angle adjustment

## Chart rankings

- #162 in Top Paid · Utilities (US App Store)

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/hamantcal-plus/id1069262620/reviews.md

### 5/5 — Good but Ugly

*2023-12-04*

I have found the app very useful for building antennas. The GUI could use an update but this one gets 5 stars for functionality. Ugly on the outside, beautiful on the inside.

### 4/5 — Not Bad

*2020-05-27*

Needs to stay with the color blue and use new Roman letters for information.

### 5/5 — Simple, does the job

*2017-11-13*

The title tell the story quick and easy.

### 5/5 — Good

*2016-01-13*

I like the look and feel.  I have not tried any wire antennas yet to see how accurate it is.  The few frequencies that I know length of antenna the calculations seemed dead on seemed to be dead on.

I like to support hams doing development.  I which we could get an NEC antenna modeling app on the iPad.

## Frequently asked questions about HamAntCal+

### What antenna types can HamAntCal+ calculate?

HamAntCal+ can calculate starting lengths for Dipoles, Inverted Vees, Verticals, and various fractional and full wave lengths. It covers a wide range of antenna configurations for amateur radio use.

### What units of measurement does HamAntCal+ support?

The app supports calculations in feet/inches, feet with a decimal point, inches only (for lengths under 10 ft), and metric units. This flexibility ensures it meets the needs of users worldwide.

### Can I adjust antenna calculations based on element diameter?

Yes, HamAntCal+ includes a diameter slider that allows you to enter antenna element diameters up to 1 inch. This helps adjust the calculated length for more accurate results based on the physical dimensions of your antenna.

### How does HamAntCal+ handle Inverted Vee antenna calculations?

The Inverted Vee calculator in HamAntCal+ features a slider to adjust the angle of the ends above ground, ranging from 45 to 20 degrees. This accounts for the change in resonant frequency based on the antenna's configuration.

### Does HamAntCal+ provide exact antenna measurements?

No antenna calculator can provide exact results in every situation. The app's calculations are a starting point, and users should always add extra wire and trim to the exact frequency using an antenna analyzer or SWR meter after installation.

### What is the frequency range supported by HamAntCal+?

The Dipole, Vertical, and general Length calculators support frequencies from 30 KHz to 500 MHz. The Inverted Vee calculator has a maximum frequency of 60 MHz.

### How often is HamAntCal+ updated?

The app was last updated on June 29, 2020, with version 1.5.5. Previous updates have included optimizations for newer devices like the iPhone X and added features like the Inverted Vee height slider.

### What is the price of HamAntCal+?

HamAntCal+ is a paid application priced at $1.99. There are no in-app purchases or advertisements, offering a straightforward utility experience.

## Version history (last 2 releases)

### 1.5.5 — 2020-06-29

General update for IOS 13 and interface cleanup.

### 1.0 — 2016-01-04

No release notes.

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## More apps by State Road 41 Apps LLC

- [HamAntCal](https://appshunter.io/ios/app/hamantcal/id539373704)

All apps by State Road 41 Apps LLC: https://appshunter.io/developer/986230800

## Related topics

[antenna calculator](https://appshunter.io/ios/topics/antenna-calculator)

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*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 2026-09-06.*