4' Open Array Only f/GMRâ„¢ 424, 624, 1224, & 2524.Pair this 4 ft (1.22 m) open-array antenna with a pedestal for a better view of the open waters around you. Used with the GMRâ„¢ 424 xHD2, GMRâ„¢ 624 xHD2, GMRâ„¢ 1224 xHD2, and GMRâ„¢ 2524 xHD2.WARNING: This...