If you're really serious about good reception, you should get an antenna
designed for FM, and put it in the attic.

I don't see putting a T antenna outside. If you stick it to the siding, you
won't be able to move or rotate it. It will gradually deteriorate, and
performance will go down a bit when it rains.

Radio waves pass through most non-conductors, so as long as the antenna is
above ground (that is, not in the basement -- dirt is a conductor) and near
the walls of the house, you should (?) get passable reception in a
strong-signal are.

I like the AudioPrism antennas. Not cheap, but unlike the Terks, they
actually work. * The 6500 is excellent in strong-signal and even suburban
areas, but is no longer made.

http://www.audioprism.com

* About 15 years ago, I brought a Terk antenna back from the SCES. It
actually gave poorer performance than 3' of wire.