Now, my question is would I still be able to hear this frequency even if I was out of the coverage area by just a little bit.
I'd point out that the circles drawn around the repeater sites are not really "coverage" areas. The FCC license will show that the agency can use their radios in a certain radius around their repeaters. Often it will show something like "32KM radius around center point" or something to that effect. That doesn't mean that the repeater actually covers all that. Radio system coverage is a very complex thing that is impacted by local topology, large buildings, antenna design, tower height, etc. Drawing a simple circle around the repeater is no more accurate that throwing a dart at the wall blindfolded. I run a few radio systems, and I'm in the hills/mountains, and I can tell you that the coverage areas shown on the RadioReference maps do not reflect reality in any way.
Building out a public safety radio system is a huge task. The agencies spend a lot of money on hiring experts to do this stuff. The costs can be quite high when you figure in towers, antennas, coaxial cable, repeaters, all the other hardware, etc. Agencies rarely put much effort into designing coverage much out of their area of jurisdiction. It's costly and it's not needed.
So, don't put a lot of stock in those magic circles drawn on the map. They really don't mean much of anything as they don't take into account the realities of local terrain, system design, etc. However, if you live out on the plains and it's perfectly flat between you and the tower, then chances are good that you'll be able to hear something
And unless there is someone local to that system, and you are willing to share where you live, no one can really give you reliable information about coverage.
What you can do is try the radio out and see if it works. It might, it might not. Don't expect miracles with a scanner, a stock antenna and having it sitting inside your home, especially if you are on the fringes of coverage.
If you cannot hear the system from inside your home, try taking the scanner up on your roof and see if you can hear it from up there. If you can, you'll need put an external antenna outside your home, up as high as you safely can, and fed with the highest quality coax you can afford.
Or better yet, tell us what system it is you want to listen to, and a general idea of where you live, and maybe someone can assist.
