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holl_ands | Home > Omni & Quasi-Omni Directional Antennas > Browse:FM Flat-Swept SBGH H-POL OMNI-PLUSFM TRIAD 4xRectangular-Loops H-OMNI-PLUSFM Goalkeeper Quad-Trap+Spurs Quasi-OMNIFM TRIAD Array of Dipoles H-OMNIFM Double-Hoop H-POL OMNIFM Double-Hoop + Vertical-Dipole OutsideFM Double-Hoop + Vertical-FD-OutsideFM Double-Hoop + Vert. Dipole In CenterFM Double-Hoop + Vertical-FD-In-CenterFM Double-Hoop + Vertical Whip OutsideFM Vertical Folded Dipole VPOL TRUE-OMNIFM Vertical Stick Dipole V-POL TRUE-OMNIFM + VHF Discone V-POL TRUE-OMNIFM Monopole Whip over Groundplane OMNIFM Turnstile QuasiOMNI Antennacraft FMSSFM Turnstile Quasi-Omni - AlternateFM Turnstile - A-C FMSS RotatedFM ESS Curves - Fracarro & DipolFM ZigZag - Triax FM ZigmaFM Right Circular Folded Dipole PairFM Cycloid Dipole - Circular Polarized490 MHz Flat-Swept SBGH H-POL OMNI-PLUS490 MHz Flat-Swept SBGH OMNI + TOP-HAT490 MHz 3-Dipole TRIAD Array H-POL OMNI490 MHz Crossed-Dipoles + One TL - OMNI490 MHz Crossed-Dipoles, 2 Unequal TLs490 MHz 7-El Yagi TRIAD H-POL OMNI-PLUS490 MHz 4El Yagi Triad H-POL True-OMNI490 MHz Collinear Helical HPOL OMNI-PLUS490 MHz Double Diamond H-POL Quasi-OMNIUHF Vertical Folded Dipole V-POL OMNIUHF SBGH H-POL OMNI-PLUS by nikimlUHF Hoverman Type 1 H-POL Quasi-OmniUHF M4 (10x9.5) Twisted 4-Bay Quasi-OMNIUHF 2xM4 Twisted 8-Bay - Quasi-OMNIHi-VHF Goalkeeper Quad-Trapezoid+SpursHi-VHF Monopole Whip V-POL TRUE-OMNIHi-VHF Vertical Folded Dipole OMNICh2-69 Crossed Loops 90-deg Phase ShiftCh2-69 + FM Crossed Loops - UVOX-22m "Classic" 3QWL+QWL J-Pole
FM Double-Hoop + Vert. Dipole In Center FM Double-Hoop plus Vertical Dipole Omni (IN CENTER OF HOOP) analyzed using 4nec2. This antenna responds to both Horizontal and Vertical Polarization, although they are only have equal Raw Gain at about 97 MHz. Below 97 MHz, Vertical Gain is reduced by up to 9 dB and above 97 MHz Horizontal Gain is reduced by up to 5 dB. However, Total Gain (Vert. + Horiz.) remained between -1.2 and +2.3 dBi across all angles and frequencies. SWR (300-ohms) was under 6.2 Although Raw Gain varies quite a bit,  the Omni-Directional azimuthal coverage remains very consistent across all angles. However, users may be unhappy with performance if a station is only transmitting one Polarity. Date(s): 21 Dec 2011. Album by holl_ands. 1 - 15 of 15 Total. 3879 Visits.
enlarge 43KB, 662x1024 1 Double-Hoop + Vertical Dipole In Center 3D View enlarge 112KB, 348x1024 2 Double-Hoop + Vertical Dipole In Center Front View [1 big box = 5-inches] enlarge 269KB, 1024x990 3 Double-Hoop + Vertical Dipole In Center Top View [1 big box = 2.5-inches] enlarge 163KB, 1152x584 4 Double-Hoop + Vertical Dipole In Center FM Total Raw Gain FORWARD enlarge 147KB, 1152x584 5 Double-Hoop + Vertical Dipole In Center FM Total Raw Gain to SIDE (0-deg) enlarge 171KB, 1152x584 6 Double-Hoop + Vertical Dipole In Center FM SWR (300-ohms) under 6.2 enlarge 168KB, 1152x584 7 Double-Hoop + Vertical Dipole In Center FM SWR (75-ohms) Excessive on Higher Freqs enlarge 154KB, 1152x584 8 Double-Hoop + Vertical Dipole In Center FM SWR Impedance enlarge 110KB, 354x1024 9 Double-Hoop + Vertical Dipole In Center Side View [1 big box = 5-inches] enlarge 333KB, 1024x1024 10 Double-Hoop + Vertical Dipole In Center Azimuthal Pattern at 87 MHz enlarge 321KB, 1024x1024 11 Double-Hoop + Vertical Dipole In Center Azimuthal Pattern at 91 MHz enlarge 332KB, 1024x1024 12 Double-Hoop + Vertical Dipole In Center Azimuthal Pattern at 97 MHz enlarge 335KB, 1024x1024 13 Double-Hoop + Vertical Dipole In Center Azimuthal Pattern at 103 MHz enlarge 332KB, 1024x1024 14 Double-Hoop + Vertical Dipole In Center Azimuthal Pattern at 108 MHz enlarge 49KB, 791x1024 15 Double-Hoop + Vertical Dipole In Center 4nec2 File
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