I don't know the answer to that, but I can tell you I'm unable to pick up the Hennepin West system way over here in Falcon Heights with my roof mounted el cheapo RS ground plane antenna.
From Northwest Plymouth, I get a full signal on Ramsey County using just a discone antenna mounted about 4 feet about my roof. I get Dakota and Anoke just fine too. I think I paid like $49.95 for the antenna.