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As for communications through voice, try the old tin cans on a wire thing. Sounds silly but if you put one in your main defensive room and one or two going across the street to your neibours house or into a phone box (obviously after the infection kicks off (unless you’re friends with your neibour and phone box =P)) that way any roaming survivors that may need help can be directed from the safety of your home, no power needed and no zombie attention drawn!

CB is generally obsolete, having been surpassed by FRS and GPRS radios. Don’t expect cell phones (GSM. CDMA, or iDEN) to remain in operation. Marine radios operate on VHF frequencies and are a good idea if you live near shore. With all radios, your range is largely determined by line of sight. In a valley, or city street, you could only make a few hundred feet.

No one mentioned basic whistle calls. Three long whistles is a universal distress call. Two long blasts is “I am responding, where are you?” This is answered by a single blast from the victim. Responder and victim call back and forth with two blasts and one blast, respectively, until they are together. Four blasts is “All Clear”.