I just got an external antenna today for my StreetPilot ColorMap!!! For those of you that have them how did you route your cable? And where did you put the antenna at for best reception? Pictures to please!

http://files.automotiveforums.com/uploads/116428GPSAntenna.jpg

It does matter where you put it as long as it has
an unobstructed view of the sky.

I just put mine on for trips so no pictures
but I have put it a number of places on the roof
and all of the locations worked fine.

I have never lost sync in canyons, trees, etc.

I think your main consideration would be
where to place it in a permanent location
with concealed wiring. Maybe under the plastic roof
carrier. The carrier should not interfere being made
of plastic but you could try it and see if there
is a difference in signal strength.

Chris Coyle had a nice installation. He put
it on the same bracket that held his CB antenna
attached to the rear hatch. You might see
if he still has a picture of it on his web site.

I decided on a location for my external antenna. I have it mounted with double-sided 3M tape (heavy-duty) on the windshield in the upper drivers side, just in case the photo doesn't work! The cable is run down the weather-strip and into the cab.

I took it out and tested it for comparison against the stock ColorMap StreetPilot antenna. On average I got three to four more satellites using the external antenna. I sat in the same location and swapped the two out. Most of the time if I was facing South or West or East I got all 12 satellites! :)

http://files.automotiveforums.com/uploads/912745GPSantennaW.jpg

I installed mine this weekend. Magnetic mounted right next to the roof basket, ran the wiring through the sunroof under headliner, down the a-pillar and up the dash. Very clean. I think the rack may obstruct the view a bit, but since it's magnet I can move it around when I actually am using it.