Methods for informing a mobile device of adjacent sites in a RF communication system wherein the RF communication system comprises a first network and a second network are disclosed. A device of the present invention comprises a central tubing member to which, at least, a flexible tubing member and an absorbable member are connected at least at one point. The two parts are interlocked by a T-shaped distal end of one of the clamp members that is received in an elongated slot formed in the other clamp member. In a preferred embodiment, two filters are coupled to the output of the touch screen. An optimizing method for two frequency bands is described. One embodiment is an interference mirror having at least one layer formed from a matrix of material consisting of ZrO2 and about 2-15 weight percent of Al2O3.