Judging by the link you posted you want to listen to something that is on the Ohio MARCS network. At a minimum you'll need a digital scanner that is capable of receiving p25 phase 1. That system looks to be phase 2 capable and maybe someone local can say if they know of any plans in the near future for that to happen. Any of these will work for phase 1.
Digital Police Scanner Radios
www.scannermaster.com
If you want to future proof it a bit you'll have to spend a little more money on one that can do phase 2 which are also listed on that page.
If you're looking in the used market a radio shack pro 197 / 106, gre psr 500 / 600, or a Uniden bcd996xt or 396xt will also work. Naturally those are older and phase 1 only radios.
Others worth mentioning that aren't uniden or whistler, are the Bluetail Technologies P25RX and Unication receivers.