They are line of site and usually don't work well tucked in a cove. I guess it depends how high the walls of the coves are? At Lake Powell the rock walls are generally pretty tall. I use the Standard Horizon HX870. $210. It is the high end of hand held radios and is loaded. 6W, GPS and DSC calling. You might not want that many features?
The lowest model I would go with is HX150. $80
Mike Allen, Tigé owner since 1997