In article ,
Paul Burridge wrote:

It ain't rocket science. Someone out there must know the
radiation resistance of such a telescopic whip (which has a
ground plane of just around 16 square inches contained within the
remote control handset) and the best way to couple it to a PA
with a 140 ohm output impedance?

Paul, standard CB antennas are loaded whips, for operation
at around 30MHz. Available in the CPC catalogue for about
£10 to £20, Perhaps you could start off with one of those
and modify to suit.

Note also that there is a 433MHz licence-free band for
short distance (100m) remote control. Pre-built Tx and
Rx modules are cheap, and a 433MHz antenna would be a
breeze.

www.cpc.co.uk or 08701 202530.

--
Tony Williams.