You are correct, Montgomery HD comes off 129 (
EKB: Dish HD Locals) and Montgomery SD comes off 110 (
Dish Locals in 178 cities). The reason you get national HD is because 129 content is mirrored on 61.5.
You could actually swing the dish pointed at 61.5 around to 129. But if Dish offered to upgrade you for free, then there you go. The new dish is the 1000.2 (
Dish Network Dish 1000.2* DishPro Plus 110 118.7 119 129).
If you do decide to repoint the dish, you wouldn't actually need Dish to come out at all. To repoint the dish, find the angles at
Satellite Finder / Dish Pointing Calculator with Google Maps | DishPointer.com. Select 129 from the drop down and put the marker where you have the dish. You'll need the elevation and and azimuth. Dishpointer will tell you the general direction you need to point. You'll need to plug that dish directly into one of your recievers and do a check switch (because it doesn't work if you try to point it while it is plugged into the other dish or a seperator). Run a check switch. Then swing the dish slowly back and forth until you get a hit on 129. Tweak the elevation and the azimuth slowly until you get the best signal. Then plug that dish back into the other dish and the 110/119 dish into your reciever. Run a check switch again and you are set.