I too have just started playing with the NooElec SDR. One thing that hit me
between the eyes is that the SDR is not very sensitive. I have had moderate
success copying local two meter traffic and APRS signals on 144.390 by using
a broad band preamp at the radio and also one at the antenna, with that
arrangement the SDR hears much better.
Mark Spencer, WA8SME
Education and Technology Program Director
ARRL, the national association for Amateur RadioTM
43 Pinelock Dr.
Gales Ferry, CT 06335