I suspect your problem is that the antenna is seeing a signal that has
some components from reflections off of other building, hills, ridges,
etc. It is called multi-path.

My first approach would be to get the antenna higher in the air and then
make sure it 'sees' the transmitting antenna from the station. If you
cannot establish 'line of sight' then multi-path will always be part of
your reception.

Ed Light wrote:

Is it ok to ask about FM Stereo antennas here?

I'm running this Radio Shack 6-element FM antenna for a station at 107.3

http://www.radioshack.com/product.as...t%5Fid=15-2163

Usually it's clear in mono but not in stereo. Sometimes it's distorted in
mono.

Would a Delphi QFM-9 be much stronger and maybe clear this up?

http://starkelectronic.com/fmpage.htm 3rd one down

Thanks in advance.