eCost is terrible!!!!

just fyi, don't expect to transmit any HDTV and see it in HDTV

"3 RCA plugs for VIDEO and AUDIO input (R and L) "

Similar devices have been around for 20 years. The a/v senders I used back then take rca input and transmit it as UHF. Thus, they were called UHF- or RF-Modulators. The wife played soaps in the bedroom, and watch them in the kitchen on a 9". With a device called the LeapFrog (IR to rf sender), she could forward past commercials, change cable box channels, etc. using the remote. Good ones were about $50 in the 90s. Don't know what the range, wall-permeation, etc would be on a device they couldn't sell at $43 that was now selling for $5. If shipping cost more than the device, I'm not optimistic. as for 2cheap2eat's Q, You'd need a decoded/modulated signal to 'rebroadcast', it wouldn't make your old antenna 'wireless'. An inexpensive switch box from the Shack would allow you to switch inputs between Sat and antenna.
Not even homer's website tells you exactly what it does with the signal. I guess after feb 2009, it won't have to compete with analog broadcasts.
Surprisingly, google didn't turn up a single user review. But I was stunned to learn that Microcenter is selling it for $79.99. usually they're terrific. If it wasn't eCost, it might be worth a look.
SWIM (someone who isn't me) might buy one in cash from microcenter, return it unopened for a refund, and use the original receipt to return one acquired from eCost for $5 and make ~$75 profit. only worth considering if you happen to live near a microcenter.