I just installed a new custom radar arch from Atlantic Towers (about 4 hours with 3 people) for Mirage, a 1976 43' DC I bought in November. Going to load her up with new electronics as well from Garmin (a GPS 4212 for each station, GSD 22 depth sounder, XM Weather/Satelite, GMS 10 network hub, and GMR 21 radar) and Shakespeare 2030-G TV Antenna. I have 4 antennas I intend to install on radar arch (Radar Dome, GPS, XM, and TV) and plenty of room (3 platforms on arch). What I'm wondering is if there is a best practice for moutning heights of these items (i.e. GPS Antenna above Radar Dome, TV Antenna below Radar Dome, TV antenna as far from radar dome as possible, etc). Any advice is very much appreciated!