CM Modified Bisquare for 432.000MHz CM Derived from a bisquare this antenna shows the same pattern CM but much lower impedance CM Matching to 50Ohms can be done using a simple quarterwave of CM 93Ohm coax, such as used for Arcnet CM G. Koellner, DL4MEA, (C) 8/98 CE Free Space UNITS cm Height 1200.000 Circular Boundary F 432.000 GW 1 16 0.000 0.000 0.000 0.000 19.4188 19.4188 0.400 GW 2 16 0.000 19.4188 19.4188 0.000 0.500 38.8315 0.400 GW 3 16 0.000 0.000 0.000 0.000 -19.4188 19.4188 0.400 GW 4 16 0.000 -19.4188 19.4188 0.000 -0.500 38.8315 0.400 GW 5 16 0.000 0.000 50.000 19.4188 0.000 69.4188 0.400 GW 6 16 19.4188 0.000 69.4188 0.500 0.000 88.8315 0.400 GW 7 16 0.000 0.000 50.000 -19.4188 0.000 69.4188 0.400 GW 8 16 -19.4188 0.000 69.4188 -0.500 0.000 88.8315 0.400 S 1 32 100 0 S 2 95 100 0 Coax 150