Sorry for the late reply, been pretty busy lately and not on the CF for awhile.
As to the mount, I built it myself from an aluminum I-beam. Just cut it down to make it less bulky and less wind deviation. I believe there is a picture on my blog of how it's mounted. If not, let me know and I'll add it to the blog.

Delmarry we are looking to install the same type of configuration for our WSo100 as you have on your mast. Do you have a recommendation for the mount you purchased? Where did you get it? Also did you buy a preconfigured NMEA cable with the ends already attached or did you make your own?