Have a look at this site These Antenna have been used in Australia for some
time and have also been used by many adventure flyers like the South to
South team Oliver Aubert. These Radio Antenna have been designed to suit
trikes and Microlights, but have been used on many other aircraft
applications. Made in Australia to suit the harsh sun conditions last a long
time.
Go to this link http://members.ozemail.com.au/~mardyboy/