No, they're not cheap, but look at it this way: Three months' worth of forgone cable bills buys you the DTVPal that NYCLA* mentioned!
You had also asked about an antenna in the original post. The TVFool report shows that all the network affiliates, plus a good number of additional stations, should be easy to receive over the air at that location. This means an inexpensive antenna would be suitable.
I would recommend getting an outdoor antenna and mounting it above the roof. The strongest, most reliable signals are available there. If that's not practical, an outdoor antenna can be placed in the attic. Either way, you might want to look at
this guide for a better idea of what's involved. Putting up an antenna like this is not difficult at all for anyone used to doing DIY projects and repairs around the home. The AntennaCraft HBU22 antenna would be a good choice. It's available
here, and
here.
If a rooftop/attic antenna is out of the question, an indoor antenna should work OK for network stations most of the time. It may not be completely reliable under the best of circumstances, and it's not at all likely to work well if your home has aluminum, brick or stucco siding. If you must go this route, get a pair of "rabbit ears" made for both VHF and UHF signals, such as
this one. Local discount stores carry them, too. Don't buy a set with a built-in amplifier, because a booster is likely to hurt reception rather than make it better.