Some magazine articles dealing with cutting down receiver aerials, looked up after someone asked if it is better to cut it short or to zig-zag it in order to contain the length. Also refer to

• http://rc-cam.com/ant_exp.htm

Article from RCM&E April 2001 detailing the difference between RX circuits where you can or cannot shorten the aerial wire.

Mounting aerials in helicopters, do's and don'ts from RCM&E 1989