FM Monopole Whip over a 38-in x 24-in Groundplane anallyzed using 4nec2. Length=32-in optimized for best SWR.
This antenna responds to Vertically Polarized signals, with minimal response to Horizontal Polarization. Vert. Pol. Gain only varied from 1.54 to 1.62 dBi for all angles and frequencies, an Excellent Omni characteristic. SWR (75-ohms) is 3.0-4.5 (just slightly worse than Optimum 71-ohms "best fit").
21 Dec 201117 items6638 visitsAlbum by holl_ands
enlarge 134KB, 1024x856 1 FM Monopole Whip over Groundplane 3D View
enlarge 171KB, 817x1024 2 FM Monopole Whip over Groundplane Front View [1 big box = 5-inches]
enlarge 266KB, 1024x704 3 FM Monopole Whip over Groundplane Top View [1 big box = 5-inches]
enlarge 149KB, 1152x584 4 FM Monopole Whip over Groundplane FM Raw Gain FORWARD (Vert. Pol.)
enlarge 127KB, 1152x584 5 FM Monopole Whip over Groundplane FM Raw Gain to SIDE (0-deg)
enlarge 175KB, 1152x584 6 FM Monopole Whip over Groundplane FM SWR (75-ohms) is 3.0-4.5
enlarge 186KB, 1152x584 7 FM Monopole Whip over Groundplane FM SWR (50-ohms) is 2.1-5.0
enlarge 175KB, 1152x584 8 FM Monopole Whip over Groundplane FM SWR (71-ohms) is 2.8-4.3 is BEST FIT
enlarge 145KB, 1152x584 9 FM Monopole Whip over Groundplane FM Impedance
enlarge 308KB, 1024x1024 10 FM Monopole Whip over Groundplane Azimuthal Pattern at 87 MHz
enlarge 305KB, 1024x1024 11 FM Monopole Whip over Groundplane Azimuthal Pattern at 91 MHz
enlarge 303KB, 1024x1024 12 FM Monopole Whip over Groundplane Azimuthal Pattern at 97 MHz
enlarge 305KB, 1024x1024 13 FM Monopole Whip over Groundplane Azimuthal Pattern at 103 MHz
enlarge 305KB, 1024x1024 14 FM Monopole Whip over Groundplane Azimuthal Pattern at 108 MHz
enlarge 204KB, 1024x862 15 FM Monopole Whip over Groundplane Side View [1 big box = 5-inches]
enlarge 52KB, 791x1024 16 FM Monopole Whip over Groundplane 4nec2 File
enlarge 52KB, 791x1024 17 FM Monopole Whip over Groundplane 4nec2 File Alternative Model with SOURCE Gap=1.0-in. Agrees with other Model to within a couple tenths.
