I totally agree with Arney and Harkev. We have the Motorola model 305 (w/rubber armor) with the Nextel service. The problem is when we are in cross country mode. Away from the cities, reception ranges from "poor" to "hit and miss", at best.
I have found that Alltel and Cingular networks provide the best overall coverage with only a few "voids", here and there, as we go cross country via the Gulf Intracoastal Canal (GICW) and the Western Rivers.