well I went out tonight to see how far I can get away from the center and have signal.
I took a DBS LNB and switched the polarity on a couple TP's and started fishing for 129....took 10 seconds and bingo
45-47 quality on 129 TP 17 I think...so thats 26 off center
then went to the other side and put the LNB next to 85 and got 80 same TP for 82..which is 21 away...so my arc could be 47 right now
cant get 91 because the LNB wont fit in between 89 & 93 but might try something else