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March 10th 06, 01:16 AM posted to rec.radio.shortwave

On Thu, 09 Mar 2006 23:55:01 GMT, Bob Miller
wrote:

On Thu, 9 Mar 2006 17:17:52 -0600, wrote:

How far up in the air can a wire antenna for shortwave radio be (for
instance,held aloft with a helium balloon,ala Switzerland in World War
Two) and still be effective for receiving shortwave radio signals?
cuhulin

I imagine any height will work; HF radios of WWII were common in our
aircraft.

The only limits depend on how close you are to an airport; antenna
heights are regulated around flight paths.

bob
k5qwg
Airplanes that fly across the oceans still have HF radios.