Just installed an Atlantic towers radar arch on the boat. fairly easy task, the galley slave and i did it in a day.
Bought their " tower in a box" model, details from our e-mail exchange are;
"I am familiar with your model Tartan and the arch that has been bought most often was our Off Set arch 101.5/02.5/44. Fits 88-100" forward leg and 78-90" aft leg. Wiggle room is about 8-12" difference in width between front leg and aft leg. This arch is $1999.
Presently the sail arches are on sale for 15% off and optional equipment is less 20%.<http://store.atlantictowers.com/Sail-Arch-Accessories-s/1838.htm>
Picture can be found at;
http://www.atlantictowers.com/gallery/d ... 0_001.JPG. "
I plan to put radar, gps, solar panels on it as well as a hoist for the dinghy motor. Have seen others use it to hoist the dinghy as well.
Great option, really happy I did it.