I've searched the forum and Google and all I find it dress-up antennas.
I have been trying to find something that is a replacement, not a cover-up.
I currently have a Beat-Sonic, but I need Sirius/XM, AM/FM, and GPS. So, I'm sending out info requests to antenna suppliers.
If anyone has more expertise in this area, please PM me back.
So far, I've only found this company,
http://g-antetech.en.alibaba.com/
There's got to be more out there.
Where's a Radioshack geek when you need 'em.