How can I improve the antenna of my FM modulator?

I have a car (2003 Mitsubishi Galant) with the radio antenna embedded in the rear window.  I want to add an antenna to my FM modulator to improve the signal quality.  How can I determine the best antenna length and placement?

I already have information on how to mod the device. It's a Soundfeeder SF100.

And yes, this will become an Instructable eventually.  :-)

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NachoMahma7 years ago
.  Just about any antenna designed for FM (88-108MHz) use will work. The problem will be in figuring out how to mod the SF100 to accept an external antenna.
yoyology (author)  NachoMahma7 years ago
Thanks!  I suspected that would be the case.

I've got the actual modding part covered, thanks to someone called "jdacura".

http://www.jdacura.com/jdacura/projects/sf100/
you have to do is you design your antenna like this picture to super powered antenna.
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This is funny! Though I don't think it will fit in a car!
 This is what my husband did - http://drupal.brainstomp.net/?q=node/10 to hack a Monster iCarPlay in the same manner.