I don't have a big loop, but I have not had any trouble with using a counterweight on my inverted L with one end supported at about the 40 foot level in a 60 tree. I use a compound pulley arrangement that halves the distance the counterweight must travel. About 30 lbs of counterweight supports my 100 foot antenna with about 15 lbs tension on the antenna wire.
It has survived winds in the 60 to 100 mph range on dozens of occasions since I put it up in 2007. On one occasion the winds were strong enough to cause the counterweight to move about 10 feet, meaning the tree trunk was moving 20 feet about 2/3 of the way to the top. While "shock loading" resulting from sudden movement is a concern, my reasoning is that the wind must set many tons of tree in motion to start moving the counterweight, so the tree is a very robust "shock absorber" that prevents very sudden movements. The 5/16" Dacrom ropes I use have also survived nicely for 5 years without issue. As others have noted, the challenge when using a counterweight system is to keep the antenna from "walking" the counterweights to one limit. I opted to avoid hanging both ends of my inverted L in trees for just that reason. 73, Ron AC7AC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
