You might try a filter between antenna and Funcube or try to use an antenna that is only sensitive in a small part of the Tetra band. Do not use one of these DVB-T mini antennas that come with the USB sticks. These are optimized for covering the whole TV band. This includes Tetra but also everyting else :/
On that subject, can anybody recommend a good portable antenna for use with the FCDP?
At home, I can pick out some (presumably) TETRA signals (in NRW, DE) by hooking up to a DVB-T booster antenna I have and scanning around 420MHz.
As mentioned, portable laptop antennae like those for WLAN and DVB aren't ideal. So I'd be interested in finding something to use while out-and-about with the FCDP, which could be good for picking up the most common TETRA bands.
Thanks, Chris