I'm not sure what you mean by cheap, but I picked up the largest standard outdoor antenna from Eagle Hardware for $60 and installed it in my attic. Depending on where you live you should be able find a position to put it in that allows you to get all of your signals. Radio shack has the equivalent for about $110 unless you can find it on sale. Those are the top models of the standard class and they get UHF, VHF & FM. You can get smaller ones for half as much or just a plain UHF for $30. Stay away from the new fancy multidirectional or high tech looking ones as they're expensive and don't work as well.

-jeff