Check this company out. I believe Saleen used them back in the day when a radio delete car came to be converted. When Saleen installed the Kenwood (or Sanyo) they would also install (on some cars, I don't think all got this brand..some got Ford) an antenna by Harada. Well it's been almost 30 years and Harada seems to have advanced quite a bit past the mast antenna that Saleen used.
Hidden in glass, hidden in body, shark fins, and a few other cool options. I bet they are expensive though:
http://www.harada.com/
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