matt weber wrote:
All that your experience says is that SDR probably has poor front end
selectivity.

On 3/18/2014 12:59 AM, Geoffrey S. Mendelson wrote:

Almost none. The dongle was designed to pick up megawatt digital TV stations
with short antennas (about 4-6 inches) antennas. Using it as an SDR is
a happy accident.

A great tutorial / construction article on how to use the dongle as a DC
to daylight software defined radio (SDR):

QST magazine, January 2013, pp 30-35.

If you know a member of the ARRL, they can print a copy of this article.