An improved pitching machine is provided. The methods and apparatus employ a tag element associated with each object-to-be-located, and interrogation system for searching one or more spatial regions for such tagged items, as well as mechanisms for identifying objects within the interrogated region. The presence of the copolyesterether in the substrate reduces the tendency of the card to delaminate in use. The exposed portion of the implant may have an external shape or configuration with a variety of attached andor integrally formed mechanical retention and stability elements. At least one k-to- weighted phase interpolator has a first input for receiving an output signal of said first delay circuit and a second input for receiving a second input clock signal having a phase of to generate an output signal having a phase of xkn where k is 1, 2,. A portion of second ground plane from ground connecting means to ground connecting means along continuous edges of second ground plane acts as an antenna.