Good Ole Mandeville. That tree must be the only one left, or you are further back from the north shore of Lake Ponchartrain.
Right now the New Orleans channels are only in SD. I believe they just started the Baton Rouge and Lafayette locals which are also in SD. If I remember right, Baton Rouge and part of Mississippi are in the same DMA, but I am pretty sure you are not part of that DMA.
I was going to say that compasses are not that accurate and that if you have a Dish 1000, to pick up 110, 119, and 129, that you must just be barely missing 129, since there is not a large distance between the two. However, I just read your post again, and you said you are using DirecTV to pick up 110 and 119.
I don't know a lot about DirecTV, but I don't think a single dish from them would pick up 110, 119, and 129.
If you have a Dish 1000, maybe physically moving it a little to the east, or a lot to the west would give you all 3 signals. However, yes you can use a second dish to pick up either 129 or 61.5.
Since you asked the question, I would say you are not familiar with all of the equipment. Therefore, may I recommend you list what you are planning on using, and I'm sure someone will give you a more accurate answer that may save you some headaches.
.....Receiver or receiver model numbers;
.....Dish type or types (legacy or DishPro LNBF)
.....Any switches (SW21, DP34, DPP44)
.....What programming (Standard, HD, Local, Any International)
Good luck.
PS - I believe it was end of March that the (ten) New Orleans locals were moved to 110, from 121 which required a SuperDish 121 dish.