Gamma radio / antenna replacement recommendations?

[crossley family <crossley@northwest.com>]

I have been trying to follow the various radio related threads on the
list in an effort to resolve the less than adequate performance of the
gamma radio in my wife's '93 90CSQ. I am lost!  We both like the sounds
that come out of my '91 200Q Bose system, so you audiophiles know that
we are apparently not very discerning when it comes to sound!  We both
agree that her system really is bad when it comes to FM reception and
radio sound quality.  The car has an Alpine 5951Z remote CD changer,
which sounds OK through the system, so I have concluded that the problem
is probably related to the antenna, the tuner or both. The antenna is
one of those in-the-rear-window jobs, which I notice has been
discontinued in subsequent years in favor of a fender-mounted unit.  Is
that my problem, or is the radio junk too?  I would appreciate any BTDT
experiences on this issue.  Is the Audi OEM antenna for the later years
the way to go or am I better off going with an after market unit like a
Hirschmann?  What is the recommended replacement radio?  What are the
best mail-order sources for these components? TIA for any help you can
provide.  BTW, I am continually amazed (overwhelmed?) at the diversity
of knowledge that this group has.