A4 antenna amp?

[Jay@aol.com]

I've got the stereo mostly installed now (I'll submit a stereo FAQ when it's
complete).  However, the FM reception is even worse than before - it seems to
drop in and out about every 10 feet.  

I am running the Sony's "power antenna" lead to the car's "antenna switch"
line, and it -does- get worse when I disconnect it, so I know the antenna's
getting at least some power.  The Sony lead is marked "0.1A max", and I
wonder if I need to supply a full 10A power feed to the antenna amp somewhere
as well?  Where is it actually located, so I can see the wiring?

Jay