The West Palm Beach station became WUUB in 2012, when CBS divested itself of the station. It's currently "ESPN 106.3", owned by Good Karma Broadcasting LLC.
The WHFS calls (AM and FM) currently reside on a CBS owned Sports Talk duo in Tampa/St. Petersburg FL (and have for some time now).
These stations will soon be traded away in a swap with Beasley Broadcasting. Not sure what happens to the calls at that point (CBS may park 'em elsewhere before the swap).
Though branded as "HFS", the Towson station's official calls are "W285EJ" (a low power translator for WWMX-HD2).