Your limits there are extremely narrow and overly optimistic. Anything over about 1 mile effective distance in practice usually requires a 10's to 100+ feet high antenna and/or a HAM license, well beyond a $50 set of minimally licensed GMRS radios (plus the GMRS license - last I checked was bout $10 per decade for a family license, with no test required).

The only plausible scenario I see for you is if someone nearby has a repeater you can use, which is also a key failure point, as if their repeater ever goes down, you're back to basic line of light distances, which I've generally found to be more like a 1 mile range in practice, even in mostly open and fairly flat rural farmland type terrain.

For a few hundred dollars you could set up your own GMRS repeater, either house or vehicle mounted, although, the key factor is antenna height, making the home setup of a repeater typically resulting in much longer distances than a vehicle mounted repeater.

In short, the general naive concept is that it's possible to buy a couple cheap "walkie talkies" and communicate across many moles, but that's not remotely accurate in practice, with anything over trivial yelling distances requiring licensing, knowledge, and often costly equipment (antenna towers alone can easily cost thousands of dollars).