This mount worked perfectly for the installation of my Gen 2 Starlink dish. Down pole on the dish fits this mount perfectly. You can either drill for a through bolt, cut a square hole for the Starlink push button, or use a u-bolt clamp. I opted for the u-bolt. A bonus was that it has the same footprint as the old, larger diameter DirectTV mount I was replacing. I didn't have to drill new holes.
Purchased a ClearStream 4MAX COMPLETE UHF VHF Outdoor HDTV Antenna with Amplifier, 20-inch Mast, 30-foot Coaxial Cable, and Splitter along with a Universal J-Mount Mast 40-inch with Mounting Hardware. Installed the units outdoors in SW UT. Connected the antenna to a Tablo WiFi streaming unit and now comfortably watch any of 46 channels of broadcast programs on multiple TVs in my home. Superb products, reasonably priced and excellent customer service. Am ~75 years old and sometimes my brain writes checks my body can't cash, but this installation was well within my comfort zone. Go for it!
This mast isn't just longer than the standard 20" mast, it's MUCH more beefy. The tubing diameter is much larger and the foot-plate is a heavier gauge steel. I live in a very windy area picked this one because it should be more stable when the weather is bad and the winds are blowing. I'm using it a 4Max, which included a 20" mast, but I think this one is worth the extra cost.
I needed an extension for my antenna so I could mount it at the peak of the gable end without it interfering with the roof line. It was perfect, it clears the roof and let me set it heading 305 degrees. Now I get 30 plus channels.
The J Mount I ordered arrived early and worked well for me. The included hardware was all I need to install the antenna. Putting the antenna just a few feet higher made all the difference. I now get all the local channels (42) in the Cleveland - Akron area.