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You need only a modestly directive antenna, but that antenna needs to be able to receive high-VHF (for NBC, ch. 10 and a PBS station on ch. 8) along with UHF channels. A Winegard 7694P or an AntennaCraft HBU-22 will fit the bill. You may have to experiment with the direction to point the antenna for best results (somewhere between due south and 245 degrees.) Do NOT use a preamp, as the multiplicity of strong signals will overload it. You should have enough signal to drive two TVs.
Quick math: the goal is to have a noise margin of 10 or more to protect against random stuff. Attic installs can knock a good 20 dB off of signals, but you will have 8 dB of antenna gain, so subtract 12 from all the noise margins of the stations you'll be pointing at and you'll see that you still have plenty left over for cable losses.
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