My worse fears have been confirmed i guess. I thought i had enough clearance over the trees in my backyard. Looks like i was wrong. When i tried to get 91... i was surprised to see it peak at 70.... then i saw it go: 25 - 75 - 45 - 35 - 55 - 60 - 75 - 40 in the following 15 seconds. It was extremely windy on saturday which is a very good indication that there must be a tree blocking 91... Same thing for 119... could never lock the sat at all even if i played with skew - elevation and lnb position. Good news is i was going to cut those trees... most of them are almost dead. But i guess i was lucky to get 110 with such a good signal through them.