West Fork was contracted by the dam owner to design and fabricate PIT antennas for detection of American eel and sturgeon through their newly constructed removable bypass. A dual mode (FDX/HDX) PIT tag detection system was designed in consultation with Kleinschmidt engineers to detect fish moving through two dam bypass routes. Both passage routes include the challenge of detecting PIT tags traveling in excess of 18 fps. The louvered bypass antenna (36 inch wound coil) was constructed on site and the antennas were shielded with an aluminum “clam shell” shroud to reduce EMI and to physically protect the coils. The face antenna was designed with the use of ferrite tiles to project its read zone forward substantially beyond the end of the bypass pipe. The paired coils of the face antenna were designed to focus their field inward and also downstream to elongate the read zone.