The other month I ordered a DVB-T USB dongle from China via E-bay for £12!
This little device uses the Realtek RTL2832U chip with the Elonics E4000 tuner IC.
The RTL2832U outputs 8-bit
I/Q-samples, and the highest theoretically possible sample-rate is 3.2
MS/s, however, the highest sample-rate without lost samples that has
been tested so far is 2.8 MS/s. The frequency range is highly dependent
of the used tuner, sticks that use the Elonics E4000 offer the best
range (64 - 1700 MHz).
I've been using it with a Discone in the loft and after testing a few programs have settled on SDR# .