Re: [TowerTalk] Fwd: Change in Frequency As Antenna Height

[jimlux <jimlux@earthlink.net>]

On 6/2/16 9:51 AM, Steve Hunt wrote:
> Here are the resonant frequencies I measured of a 10m half-wave dipole
> on a telescopic push-up mast at various heights above ground in my back
> yard:
>
> 5ft    29.359MHz
> 10ft   30.499MHz
> 15ft   30.889MHz
> 20ft   30.407MHz
> 25ft   30.179MHz
A variation of about 700kHz...

That's roughly consistent with what I modeled at 40m (100-150 kHz 
variation).. same percentages to one significant figure..
And, a big jump as you got more than 1/5th wavelength away.


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