Getting ready to mount some antennas on a 120' tower (near the shack) so have some questions about my 2M5WL stack. All antennas will be horizontally polarized. Putting a large 11el 6M yagi (with a 50' boom) on the lowest position on the mast (just a few inches above the tower top). Then was going to mount one of the 2M yagis 5 feet above the 6M yagi. The optimum stacking distance between the two 2M5WL yagis is 10' according to the specs. I had also wanted to put a 70cm long boom up there too. So if I wanted to keep the 2 meter stack pattern clean, I probably should not mount anything between the two 2M yagis and then mount the 70cm yagi about 5 feet above the top 2M yagi. But the mast is starting to get pretty long at this point. It's getting to be about 21 to 22 feet above the tower. Getting a bit long even though most of that is a steel pipe. Wondering if I should just be mounting the 70cm yagi between the two 2M yagis so 5' between each yagi all the way up. Even if I attempted to keep the pattern clean on the 2M stack by not mounting anything between them, I doubt my pattern is all that clean with a 50 foot yagi just 5' below the stack and another 70cm yagi 5' above the stack. So is it really worth the extra mast length by not putting anything between the two stacked yagis? I have no problem with the extra mast if its much better, but do you think it's really worth it or will my pattern be distorted enough as it is with the other yagis on the tower that mounting the 70cm between the two won't make a big difference anyway. Any thoughts? It would have been better to increase the distance between the 6M yagi and 2M stack and also the same with increasing the distance from the 70cm yagi but the mast would be crazy long and would really bounce around lots in the wind increasing the chance of some kind of failure. Or better yet putting only the 2M stack up there by it's self, but it's hard not to take advantage of a 120' tower near the shack for the other bands.