I recollect back 10 years of so ago, SUNNY 95 was off the air for a few hours in the afternoon, and I was able to pick up Q95 WFBQ out of Indianapolis at Tuttle and 270 in Dublin.
Not entirely Columbus related, but about 5-6 years ago on a bitterly cold Colorado night, I went for a walk near my house in the Denver suburb of Highlands Ranch. I took my little Sony walkman radio instead of my iPod to listen to Matt Drudge at the time on Sunday night. I had just put batteries in the radio so it defaulted to 550 AM unbeknown to me, and low and behold I was listening to Drudge loud and clear; thinking I was listening to KOA out of Denver until the first commercial break; when in fact I was picking up KFYI's 1000 watt signal out of Phoenix, 800 miles and change away. Amazing.