Subject: Does a TV antenna that connects to a wall outlet really work?

I constantly see advetised the TV antennas that plug into the wall 
and supposedly turn all your house wiring into one massive TV 
antenna. Living in the LA area this would be as good as cable with 
all the local networks. Rabbit ears don't do the trick. I'm too lazy 
to put a real antenna on the roof and the homeowners association 
wouldn't allow it anyway. If it works this would be a low cost 
alternative to cable. Please advise.

Re: Does a TV antenna that connects to a wall outlet really work?