My two cents:
I have not been pleased with the hidden HD antenna. I've posted this before but I was "given" one of the HD units a couple of years ago to try. Really got it at dealer cost and no installation fees....anyway, I asked them to leave the feed in place to the regular antenna just in case I wasn't happy with the HD hidden and glad I did. I went from decent reception to maybe getting one good local station on the hidden. I listen to quite a bit of FM along with the CD and iPod so I need the FM to be the best possible. It
was not with the hidden. I pulled the fuse, pulled the feed out of the radio and re-installed the normal antenna and never looked back.
If you don't listen to FM much then lack of good reception may not be an issue for you. It was for me, however. Also, the other options out there may give you better service/reception. However from the posts in this thread along with other threads, the hidden antenna, no matter the brand, does not show to be a consistent option.
Good luck with whichever route you choose for your bike...
