While I usually suggest Ham radio, just because of it's adaptability in bad times, and the fact that most of the equipment (including the repeaters around here), can be battery and solar powered, GMRS and CB comes in a not too far away second and third place. GMRS (and I'm talking TRUE GMRS, not the bubble pack radios) has potential because it can be used with external antennas, and use repeaters. Almost all of the bubble pack radios can't use repeaters (Garmin Rinos are one of the FEW exceptions). And NONE of the bubble pack radios allow you to remove the antenna and use a remote antenna (Antenna
height, not power out means everything on VHF, UHF, and above).
Check out the local listings for GMRS repeaters in your area BEFORE thinking about going the GMRS route. You need a repeater that is within 20-30 miles of you and where you want to go for it to work well with a handheld GMRS radio. You can check here for repeaters in your area:
http://www.mygmrs.com/browse
Keep in mind that while some are open, others DO want you to help pay for the upkeep of the repeater (they can get expensive). Some are members only, and others are open.
No matter what the status, GET PERMISSION from the owner or owning group BEFORE you decide to use the repeater, as you are using someone else's property and efforts.
If you are looking for a good GMRS handheld radio, look for one that:
Has a removable antenna with a standard connector. A FRS/GMRS hybrid radio can not have a removable antenna (FCC rules), so they are about useless outside of VERY local use.
Has 4 watts maximum, but the ability to drop that power if you want, preferably to a 2 watt, and 1 watt or less setting.
Get one with at LEAST 40 memory positions. While there are only 22 "official" channels, you will want to be able to setup both odd pairs (for some repeaters), as well as paired channels with CTCSS tones (sub-audible tones needed to activate repeaters). The more channels, the less you will have to reprogram your radio. And most of the GMRS radios out there will NOT program from the front panel keypad, you need a PC.
MAKE SURE THAT THE RADIO IS FCC
PART 95 CERTIFIED. There are a LOT of chinese knockoffs that are out there, and even a few that have FCC "certification", but they usually are not part 95 certified, so getting caught using one can get you into trouble (you may get fined, lose your radio, and possibly your GMRS license). Get a legitimate GMRS radio.
If you want a mobile unit, look for one with at least 40 watts (50 watts is the maximum the FCC allows). Also make sure that it is Part 95 certified.
On any model, mobile or handheld, make SURE that you get everything you need to program the radio. WIthout this, the radio is usually useless, or at most, only will work on the channels as a simplex unit (transmits on the same frequency as it receives). This will not work for repeaters, since you need to transmit on 467.XXXX MHz, and receive on 462.XXXX MHz.
Get your license. One license covers your whole family, and no tests are needed. With all of the bubble pack radios that have been sold, the real GMRS users are VERY quick to go after (or have the FCC go after) people using the GMRS frequencies that do not have a license. This is especially true if you try using their repeaters without a license. When the FCC created the FRS radio service, they made it use the same interstitial frequencies that the GMRS users use, effectively dumping millions of people on those channels "for free", and making the licensed users of that band, have to deal with the unlicensed users of FRS radios. They are not too happy with just that part, the other problems that the FRS users are just icing on the cake.
A good example of a FCC certified, GMRS handheld is here:
http://www.gmrsoutlet.com/product.php?productid=44&cat=3&page=1
More info on GMRS:
http://home.provide.net/~prsg/wi-gmrs.htm
Once you get your license, and get your radio, get (or better yet, make) a set of good external antennas. Use a good 5/8ths wave for the car and the house, and make a 8 section coaxial collinear for portable use.
A good coax collinear design (just recalculate the figures for 465MHz instead of 444MHz):
http://www.rason.org/Projects/collant/collant.htm
I'm using one of these antennas, 12 feet off the ground, with one to two watts and get into repeaters 40-50 miles away. If I raise it to 45 feet off the ground, I can hear signals from as far away as the DC area, and use repeaters 60+ miles away. And the antenna is portable, with a rope loop at the top so that I can pull it up into a tree if I need to use it on the go.
Once TSHTF, there are going to be a lot of cell towers that will have "gone dark". Imagine the range that you can hear signals from if you get your antenna hoisted up that high...
Loup