The device is a super-regenerative receiver. The antenna
is part of the oscillator circuit. If you change the
length of the antenna, you change the resonant frequency
and/or possibly cause the oscillator to stop oscillating.
Either of those results will cause the receiver not to
work right.
--
73, Cecil *http://www.w5dxp.com

Hi Cecil

Thankyou very much for explaining that to me - yes i didnt know that
as a superregen, the antenna becomes part of the resonant circuit!

Thanks!
Shelton.