Ya this is what my brother in law wanted to start with to see how well it worked. Which I have no problem with and don't mind the coverage I get just the way they are. My brother in-law now wants to put them higher because I have ten feet of cable not being used and he doesn't like that. Which again I am cool with cause he will make sure and do it right. I just need to find the right parts first. I really need to go higher than 20' but that is all the cable I have. Plus like you I would have to be about 75' up in the air.Same problem I deal with Bear. Tree's all around my house...
Mounted mine the same way...
Low loss lumber ..Lol
Good luck getting them up in the air. Let us know what you come up with and how it performs.
I'm afraid I would need to go up at least 75ft.
I'll have to settle for the 5 to 8K range circle I play in punching thru the tree's.