Hi Everyone - long time lurker and caller but now need some advice. My ancient Foxpro 2 died a horrific death [fell off roof and got run over] and I am now looking for a replacement. I need the call to operate from the cab of my truck which points to the NX4 but the inferno is cheaper and seems to have a more clear manner of selecting calls - name rather than number, but I am wondering if I put the caller in the back of the truck would the transmitter work from inside the cab? I have heard caller and transmitter can be too close and not work? and then would it transmit through the metal cab? Would appreciate any thoughts.