Total posts : 45366
I’m assuming you have connected the CB whip to the “wire” antenna connection, not the F connector. The wire from that point to the CB whip should be as short as possible as the tuner wants to see about 8 feet of antenna.
Keep the output selector set for the “wire” antenna connection not the external ATU connection.
If you can attach to the “ground pin” of the AC outlet that would be one possibility as the Talking House picks up its ground there.
Others have simply grounded to the chassis by screwing an F connector into the ATU connector on the rear of the unit. A wire can be attached to the shell of the connector or if it has a stub of coax just ground the shield only.
If you can, lay out a few radials, 6 to 12 radials at least 10 to 15 feet long. The ground rod itself won’t do much.