Back around 1986/7, I also did a little broadcasting on 7415Khz! Only had about 20 watts, but it was fun.
Used an old Heathkit ham rig, modified for better fidelity & modulation. I used it off and on for only about a week. During this time, I also ran a small signal (probably between 30~50 milliwatts) on 87.9 FM for a couple of months. I played Contemporary Christian Music on both.
My little FM was actually listenable for a couple mile stretch of I-95 between exits 27-24. This was mostly due to its elevation and the fact that it somewhat curved around my old neighborhood. A church friend would listen to me every morning on her drive to work. It was cute, because she even told me that she prayed for traffic congestion, just so that she could hear my station longer! Once she got off the exit, it was all gone. I had even set my alarm clock, and went downstairs to fire it up and do a live DJ show, knowing she was listening.
I did that for a couple of weeks. Then I shut it down, and that was the end of that. I found out several months later, that the FCC was actually going to come down to find and stop the pirate! I had shut it down, THE DAY BEFORE! Thus, they never had to come down.
Sometimes, God DOES watch over young fools.