I bought two of the 51600 models off of Amazon and have so far been pleased. They each hold two flags and are pretty darn sturdy and have held up over 4 years of tailgating. One of them bends a bit more than the other now (thanks to extreme weather during the 2016 Virginia Tech game), but overall I'm pleased with them. I agree w/ the other poster who said you'll want 20' or more.
20ft Flagpole-to-go has been fine for me.
Check out Flagpole-to-go on Amazon.