In article ,
Barry Lennox wrote:

I presume you are operating at 35 MHz or so? So your losses in a
30" whip are already rather high, especially into a typical RC Rx
front-end, so the material will not count for much either way.

In the CPC catalogue there is a loaded whip antenna (AR71694),
intended for mobile use, where the whip is made from what they
describe as 17/7ph milspec stainless steel. It comes complete
with all fittings, and cable with 50 ohm connectors both ends.
They give the following spec;

Bandwidth: 26-28MHz (which is the UK's CB band).
Antenna Type: 5/8 Wave.
Impedance: 50 ohm.
SWR: Less than 1:1.5.
Whip Length: 1.35m.

Is it practical to think of cutting the whip shorter for
operation at 40MHz, and (even better) is it possible to
predict exactly how much has to be cut off the whip?

--
Tony Williams.