When the girls are in Reginas room and they are listening to the radio, one says put on 98.8. Radio stations are not denominated by .even-numbers, it would have to be 98.1, .3,.5,.7, or .9.
Most modern radios are not restricted to the odd-number format that most are. Therefore, it is possible that her radio was one of those that could be tuned to 98.8, or 102.2, stuff like that.