Join Date: Nov 2006
Location: West Chester, PA
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Antennas come in many varieties, so make sure you get one that does both UHF and VHF if your local stations broadcast on both. FM isn't necessary at all for TV, but would be if you're hooking up a radio of course.
Mounting an antenna in the attic is better than having it in the TV room (it's higher, you can get a bigger and uglier antenna) but not as good as having it on the roof. Keep this in mind when shopping.
Antennas tend to be very directional. Antennaweb should tell you the approximate angle and distance of your local towers. If they're all clumped together, a Directional antenna would let you focus in on their signal. If they're in multiple directions, you can either choose not to bother with some or get a multi-directional antenna.
If you post your zip code, or a copy/paste of antennaweb's report, we can offer a little more insight.
Depending on how far the attic is from the TiVo, you might need a pre-amp to overcome signal loss in the wire.