The KING antenna mounting plate attaches to base of KING Jack antenna with included hardware. Weather-resistant ABS plastic is UV-protected and pre-drilled for easy installation. Covers all screw holes left by the old over-the-air antenna for a water-tight seal. Compatible with KING Antenna models OA8500 series and OA8400 series. Works where the hole pattern for the old antenna is 11 square or less. Plate is 11 L x 11 W. Mfr. 1 year warranty. Pre-drilled for easy installation Covers old screw holes to create water-tight seal | KING Antenna Mounting Plate | ABS Plastic