The Antenna Beam Display is centered on your location using a polar map display of your choice. The Beam Display is compatible with virtually any rotor controller. Beam Indicator displays are available for both RS232 and analog rotor controllers. Works with all major logging/tracking and rotor control software pgms. Unique software pgm is included for setting beam display modes, Rotor type, Beam Width, Long Path On/Off, +/-90 Degree Offset antenna and more. This is an international Ham venture from W3FRG and DK7NT AVAILABLE OPTIONS: SteppIR©Yagi - Automatic bearing display of Fwd, Rev and Bi-Directional Beam headings. +/-90 Degree Offset - For multiple directive antennas on one rotor/tower. Displays are available in two standard sizes, 16" x 16" and 24" x 24" with your custom designed polar map using your selections. Additional custom sizes are also available upon request. Comes with a full two year warranty and free shipping is included. Web page has full details plus a brief video display: http://www.globalbeamdisplay.com/ Custom maps and retrofits are available for the original VBI-360 Beam Indicator Displays.