The new fascination here is Software Defined Radio, or SDR. I've purchased a transceiver (called the BladeRF) from a company called Nuand. They had a Kickstarter last spring and actually delivered on their promise (Kickstarter projects are not guaranteed).
The board is much more capable than the DVB-T dongles that everyone is playing with, but of course, costs more ($420).
Because it can process much larger bandwidths (up to 40 MHz), it can be used as an ATSC spectrum analyzer. Here's a screenshot of KICU-DT on channel 36 here in Silicon Valley. The antenna was just a rubber duck laying on the workbench.
The program is called gqrx and it's running on Linux (Ubuntu 13.04). It uses GNU Radio and osmocom as libraries. All open source software.