The 1-edge path means all your stations are having to scatter over a hill or mountain before getting to you. Clicking on any of the stations in the table pops up the path profile. The couple I've looked at show that something about 17 miles from you blocks a direct view of the towers.
Fortunately, you still have plenty of signal to work with if you mount an antenna outside. An antenna like a Winegard HD7694-P or an AntennaCraft HBU-33 or -44 should work just fine.
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