My relatives lived 3 miles SE of WJJD 1160 on Ballard Rd. The field was estimated to be about 400 mV/m. The only thing that I noticed is that it came in very well on my Rocket Radio, and pinned the signal meter on my Sony Portable. I also couldn't get WHFB 1060 Benton Harbor without turning the radio to null out WJJD.
Back in Michigan, I had a Remco Caravelle that was grounded at the far end of a copper water pipe that went to the outdoor faucet. The strong signals came in softly with it off, in the transmit position, even without the battery. I figured it was the "off air monitor" for the Part 15 transmitter. You could hear it at the far end of the basement when it was quiet. The signals that usually came in were from 5000 watt stations 3 or 4 miles away.