1) Self-rescue skills learned from an experienced climber or take a course from a climbing school. Check out emsclimb.com.
2) Wilderness First Aid or First Responder Course. Check out http://www.soloschools.com/
3) Whistle, headlamp, water-resistent windbreaker with you on every multi-pitch route.
4) Cell phone with NH Fish & Game (800)322-5018, IME "Mountain Rescue Service" 603-356-6316, pre-programmed.
Ham radios are expensive, heavy, and require a license to use. I only know one guide in the valley who uses one. The FRS 2-ways are lighter and cheaper, but really only effective 2 miles or less, IF someone is listening. Not very reliable. Cell phone coverage varies greatly with provider, and what part of a ridge you are on, but I have gotten a signal many out-back places, so I carry one. The most important piece of emergancy equipment is you BRAIN! Get trained!