Excellent and thank you for the feed link. I know what you mean about ADS-B not being turned on. The only other base 52's are out of is Minot. It looks like there is not a good ADS-B feed from that area. Everything I see from there is generally 15K and above.
50 miles is just far enough away they you cant receive ground and towers directly. Even a directional antenna with a preamp wont help. Unless you able to put us a 200 foot tower etc there is not much you can do
.