Multiple location finding equipment inputs are used to enhance the location information made available to wireless location-based applications. A novel method used to determine the optimum position of the ports ensures that the maximum frequency deviation between the signal frequency and the center of the corresponding transmission passband is minimal for all possible connections among input and output ports. A substrate voltage of an nMOS transistor with source or drain connected to the bit line is set to the low level voltage or lower of the word line. The cable reel includes an electric slip ring for electrically energizing and testing the cable components while the cable is being laid.