I am considering the DTR-700 in place of FRS or simplex GMRS. The specs on the DTR700 has a 350K sq foot range. The only say it will go 1-30 stories (Doesn't say under what conitions that measurement was made). I'm wondering, since these are only 1 watt, what the distance would be using them in a camping or road trip, or even for our local CERT group.