[timgr]

Put your antenna on the roof, in clear air, with a direct line-of-sight to the horizon in the direction of the transmitters you are interested in. Aiming through your roof, adjacent buildings, or trees will greatly reduce your chances of success.

Real VHF-high channels 9, 14 and 7 should all be received by a suitable antenna mounted as above, pointed in the 160-180 compass direction. All the rest at that heading are UHF. You can either pick an antenna that has both UHF and VHF-high coverage, or pick a UHF antenna and a cut-to-band antenna like the Antennacraft Y5713, and combine the wires with a UVSJ combiner or a medium-gain preamplifier at the mast with a UHF and VHF input. You can put splitters anywhere in the wire path to feed your 7 TVs.

There are lots of antennas to consider, from Antennas Direct, Antennacraft, Channelmaster or WInegard. Conceptually, the easiest would probably be something like the Antennacraft HBU55, which will give you lots of antenna gain, cover the stations you want, and not require amplification when you split for all those TVs.

Another approach would be to use a stand-alone tuner like the HD Homerun, and connect it to a HTPC. Then reach all your TVs by wireless.