Jumping in a little late on this conversation and I think the OP has resolved getting an Antenna.
But I thought I might through in few notes about the OEM Fiero Antenna to help anybody else looking to replace theirs.
~According to my Fiero Parts Catalog
(not aways accurate) the GM Part Number is #15087886, this seems to match the Delco #.
Since the Delco/GM 2000 series Radios were used in the Fieros, it would make sense they used a Delco Antenna.
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Also looking at my original antenna mast, it measures 32" end to tip.
side note: I just put my original antenna mast w/ base +parts on eBay