Good luck getting dish to understand your situation. I had the exact same problem at my home, no where to set the Dish 1000+ without any good view of the 129 location. I live in the St. Louis Metro, and through research on this website and others, realized that my local HD's were on 118 except for my RSN which was on 129. Hoping for a quick fix (until next baseball season when I would i would HAVE to have my RSN HD!), I told the installer to install a wing dish to 61.5. He refused, saying my HD locals were on 129. He left without doing the job. He said I had a clear view of the 61.5 location but he couldn't change the work order. I then called the retailer, who ALSO told me the wrong information. I had to track down the owner of the company and SHOW him before he was convinced that my HD locals were indeed on 118.
He sent out a new tech that then told me he couldn't install at the 61.5 location because of line of sight issues. He didn't want to put the wing dish at a different location where there was absolutely no issues, about 10 foot away, which the first tech suggested. Again, he told me that I wouldn't get any locals. with that setup anyway. He left.
Finally, I dropped about 150 bucks and got the tree trimmed. 129 is no problem now!
Point of Story....sometimes its easier to fix the problem then fixing dish's problem!