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I have a Talking House transmitter and use the Talking House remote antenna ATU. The antenna/ATU is mounted above my TV antenna which is on a 5 foot mast on a tripod on the 2nd floor roof.
From the ATU ground connection, a 2 foot ground wire connects to 6 radials, each about 12 to 15 feet long. They are equally spaced around the base of the antenna.
I found there was an improvement in coverage. Not a substantial difference but a noticable difference.