The in-line antenna amplifier was a shortish, aluminium "cigar tube" looking beastie, into which you inserted the antenna cable. You wired the amp to +12V, and then took the output cable to the empeg antenna input.

You should ask a knowledgable friend to have a look at your installation for you to see if it has been put in.

If you can't see it, then mail Car Support for one.

PS. I actually found on my (un boosted telescopic) antenna that the amplifier made the situation worse. I found that I could impedance match the antenna to the empeg by shortening the tele to approximately 1/3 of it's full length, and I get really excellent stereo reception. If you don't believe this is possible, then come over to the owner's meet in July and you can listen to my Mk 1 setup in the Mini, complete with AF RDS....