FM Double-Hoop plus Vertical Whip Outside analyzed using 4nec2. Similar to Dipol A0221 Antenna: http://www.dipolnet.com/estore-antennas-fm,4346.htm
This antenna responds to Horizontal and Vertical Polarization, but Raw Gain is not very consistent on all angles. Vertical Whip has a Gain hole on lower freqs for Vertically Polarized signals.
Total Gain (Vert. + Horiz.) remained between -3.2 and +1.9 dBi across all angles and frequencies. However, users may be unhappy with performance if a station is only transmitting Vertical Polarity. SWR (300-ohms) was 5.1-7.1.
17 Dec 201115 items4596 visitsAlbum by holl_ands
enlarge 97KB, 957x1024 1 FM Double-Hoop + Vertical Whip 3D View
enlarge 232KB, 850x1024 2 FM Double-Hoop + Vertical Whip Front View [1 big box = 2.5-inches]
enlarge 265KB, 1024x992 3 FM Double-Hoop + Vertical Whip Top View [1 big box = 2.5-inches]
enlarge 168KB, 1152x584 4 FM Double-Hoop + Vertical Whip FM Total Raw Gain FORWARD
enlarge 143KB, 1152x584 5 Double-Hoop + Vertical Dipole In Center FM Total Raw Gain to SIDE (0-deg)
enlarge 165KB, 1152x584 6 FM Double-Hoop + Vertical Whip FM SWR (300-ohms) Under 7.1
enlarge 191KB, 1152x584 7 FM Double-Hoop + Vertical Whip FM SWR (75-ohms) Excessive on Mid-High Freqs
enlarge 150KB, 1152x584 8 FM Double-Hoop + Vertical Whip FM Impedance
enlarge 261KB, 955x1024 9 FM Double-Hoop + Vertical Whip Side View [1 big box = 2.5-inches]
enlarge 314KB, 1024x1024 10 FM Double-Hoop + Vertical Whip Azimuthal Pattern at 87 MHz
enlarge 306KB, 1024x1024 11 FM Double-Hoop + Vertical Whip Azimuthal Pattern at 93 MHz
enlarge 309KB, 1024x1024 12 FM Double-Hoop + Vertical Whip Azimuthal Pattern at 98 MHz
enlarge 322KB, 1024x1024 13 FM Double-Hoop + Vertical Whip Azimuthal Pattern at 103 MHz
enlarge 337KB, 1024x1024 14 FM Double-Hoop + Vertical Whip Azimuthal Pattern at 108 MHz
