Also, 98.9 didn't get denied an upgrade. They used to be 500 watts, and upgraded to a full Class A signal,
This is not really correct-
98.8 was originally licensed as a 3000 Watt Class A signal at 328 Feet on the WBNS tower. They had serious
signal issues due to the leg mounted antenna they used on the wide WBNS tower. They had serious nulls on the east side of town.
In 1993 they applied to move to the FM master system at the top of the tower. The ERP was something like 600 watts
at 750 feet. This proved to be a case of not enough power into the antenna as the signal was very thin and prone to
Sometime in the late 90's- I think when Jacor owned the signal, they applied for a CP to move to a panel antenna at 500
feet on the tower. They did upgrade to the equiv of 6000 watts but I believe they had to directionalize the antenna slightly
to protect WHKO 99.1 in Dayton.
The difference between a well engineered 3KW and a 6KW is really minor. On a coverage map, it's about another mile of contour.
107.5 on the other hand, has similar issues broadcasting from downtown, they have taller buildings in their antenna shadow
and a pole mounted antenna hanging from a penthouse. More power from their current antenna would only increase the multipath they already have. A move to channel 6 or 10's tower at about 500 ft would be just about the ideal situation.
As for a jump to 6KW- in addition to the first adjacents at 107.3 and 107.7 you would also need to look at the second adjacents at 107.9 and 107.1. I am not sure that either one of these has sufficient separation to 107.5 to allow 6KW. The second adjacent requirement for Class A to Class A is 19 miles.