jssimbulan

well, 30 miles may be a bit of a stretch without a 100' tower, however on a 3 story building 8-10 miles can be easily reached. Rule of thumb is that each time you double antenna height you double range, however at lower heights, being able to get over trees and buildings and hills can sometimes tripple or quadruple your range.
 
On a good day, my repeater can be hit (though unreliably) and heard from about 45 miles away by friends down in cape may and wildwood, however has dead spots the closer you get to the repeater till about 6 miles away. Thats with the antenna only being 25-30 feet up.

As KB2ZTX mentioned the repeater alone will not get you into the net. You would also need one of these:
https://shop.mygmrs.com/collections/repeaters-and-accessories/products/repeater-linking-bundle
 
This unit connects your repeater to the internet and into the GMRS server, allowing you to operate on the network. Due to simplex (radio to radio) operations not needing a license, Rich does not want simplex nodes being set up everywhere that anyone can tie into which is why you would be required to have a repeater.
 
As for repeaters themselves, I prefer the Motorola GR1225/RKR1225 (Its the same unit however the RKR1225 is rack mountable) They go for about $300 used and seem to work well. 100% duty cycle on low power (25W.) The nice part is that the bundle kit above is plug and play, order the maxtrac cable, plug it into the back of the radio and your done.
 
If your somewhat serious about setting up a local repeater for friends or family, get a BP/BR duplexer(another $300ish plus tuning), good feedline($40-100 depending on length), and a fair 460-470 antenna($150), and mount it as high as you can. You should get some good coverage given the terrain you have, looks nearly flat farmland from google earth.
 
Setting up a repeater is an expense, however if there are no linked repeaters, and very few operating repeaters around, it is an option to do if you have the time and money to put into it.

A repeater will not get you into the net either although many that do tie in via repeater. 
 
Also as reference Warrenton did have a repeater (I used it in the past). If you look at the map and click outdated listings the info should come up. I doubt it is connected to any nets but may be wrong. 
 
I can say none of mine are connected to any network's.

Hello Joe, Welcome to MyGMRS

The regional/national nets which take place every Sunday are only accessible two ways. The first is through a repeater that is networked through the MyGMRS network, the other through a Zello node (only one I know of is the Bronx zoo repeater.) If you are interested in setting up your own local repeater on the MyGMRS network there are kits you can buy from MyGMRS.com, or if you wish you can buy everything separate and build your own kit.