STI-R antenna dimensions?

There's only one real place to mount the head on the front end of my vehicle so I was wondering if anyone had the dimensions of the radar antenna so I could measure before I went looking for one... Otherwise I'll just have to "settle" for the windshield mounted Driver... I definitely need Spectre immunity.

http://www.radardetector.net/forums/...cad-model.html

Thank you.

I searched STi and STi-R in the forum search but both words came up "Sorry - no matches. Please try some different terms" Not sure why though.