DTV contracts out a lot of their work and many of their installers are pretty crummy. If you want it mounted to a block wall, I would suggest getting some 5/16" parasleeve anchors and a 5/16" masonry drill bit. You can get them at Lowe's. They have over 400 pounds of support strength on each one and he should use 4 or more if he puts up the braces. Pretty easy to install too. The installer should prefer this mount as it keeps him off the ladder. I use them as well. They aren't on any approved materials lists, but it would take a truck to pull a dish off the wall with a bunch of these bad boys holding it there.