You can listen to the Jags over WOKV (690), as they have a great daytime signal. That signal should not be underestimated.
It comes in very well here in the Charleston area, even inland about 25 miles. I've heard Jaguars games in Myrtle Beach, almost 300 miles from Jacksonville, and the signal invades deep into Panthers territory, heard all the way to Cape Hatteras, 525-550 miles away from Jacksonville.
The inland signal is also pretty good, heard to Winter Haven in the daytime.
If you promoted them well on that signal, maybe you could get some fans to come to Municipal Stadium.