FM antennae recommendations please?

This thread is a bit stale but I thought I would toss in my two cents worth. Since multipath seems to be your main problem I don't think a vertical whip style antenna will do much to fix that problem. I could be wrong but it seems to me that you want a very directional antenna, i.e. a yagi or "beam" style antenna which you can "point" at one signal source while attenuating signals coming from other directions. A beam style antenna is most sensitive from the front, the least sensitive from the sides, and fairly insensitive from the rear. The "front-to-back" ratio is usually expressed in dB. The higher the better. I have a Fanfare vertical whip antenna which is almost identical to the Magnum whip antenna and it does a fine job but its in the open with no buildings nearby except for my house. I don't have much of a multipath issue to worry me here. Hopefully you've found a solution by now. Multipath is a tough thing to deal with.

Thanks for the advice Abe, I am still considering the options, as there have been other priorities in the way of my getting a new antennae.

I have a Magnum Dynalab Etude and live in NYC on the 6th floor. The Magnum dynalb people told me to just stick a wire in the back. It works pretty well. That was two years ago. Recently I called again as I wanted to see if I could make it better and they told me to try their silver ribbon. I did and I had trouble getting any reception so I went back to my wire.