CC rather than preempt one of their predictable, boring, talk shows on WILM at 1450 ( Savage most likely), aired the Blue Rocks on their 1290 station with that power down to 42 watts thus most folks more than a few blocks from the Riverfront couldn't hear the game. At least with WILM the signal gets to the Bear area and to the upper Concord Pike, just below the PA/DEL line when dusk arrives thus serving far more people that WWTX 1290 at night.
Frankly, I don't see why they didn't air the Rocks on 94.7 WDSD. Most radio stations don't have stellar ratings at night, so why not air baseball and make some money both from the Rocks AND sponsors.