We live in Ocean Pines, so far the only dead areas we have encountered is where are kids go to school at Wor Prep in Berlin. Some places in line you get no service, other places okay. Also we have used them in Baltimore and Annapolis without any difficulty. Reception was crystal clear. We also experienced some dead space around the Chesapeake Bay Bridge Tunnel,. We used them in Busch Gardens in Williamsburg with no problems too. We've had ours since October'02. Basically very pleased. Can't wait to try them in Disney!! I'll let you know how they work there when we get back on Aug 24.