Join Date: Apr 2007
Location: Mattoon , Il, USA
Re: Ever cut the antena down
I have done a fair bit of building antennas for wireless networks. For best results if you are going to modify what you have try to make the antenna a divisible fraction of the wave antenna. I believe, and I could be wrong here, that a quarter wave antenna would be somewhere around 75cm long. I think that puts it at about 2foot 6 inches. If that is too long then you can cut it too 1/8 wave length. You just have to try to stay with in your wave length.
Wave lengths for 100 MHz
300cm full wave length antenna
Full usually produces the best option but that all depends on the type of antenna too, and since no one has a 10 foot antenna hangin' off the bike, BMW didn't think so either.
This is more info than useful. FM isn't nearly as fussy as higher frequency data networks. When you get into GHz ranges, it needs to be fairly precise.