The Answer

Check out this link for the reception tips for wpeb, a station we have worked on here in Philadelphia.
www.radiovolta.org/reception_tips.html

Here is the best basic resource on antennas on the web- from Jeremy Lansman, one of our favorite engineers and best teachers of obscure radio lore... including a great page on bogus antennas that don't work! make yourself a sandwich before you start plowing into this one- it is a real page-turner.
www.kyes.com/antenna/antennadex.html

Also check out:
www.siber-sonic.com/FM_reception/rooftop.html