Loop Antennas -- Plans for Loop Antenna Forum -- Yahoo -- Needs subscribing but lots of info here Low Band Antennas -- Mac Antenna Master Software Loops for HF -- From W2BRI HF Magnetic Loop Antennas -- By Glenn C Sperry, KI6GD -- By Wolfgang DJ3TZ Loop Design -- From QRZ Magnetic Loop Antenna 10-30 Mhz  -- From Matthew G0VBC -- From The ARRL Mobile Dual Band VHF/UHF Antenna -- Homebrew Project from VE3RGW HF Antenna  By HB9ABX MOBILE HF MULTIBAND ANTENNA PROJECT - From Mark D. Lowell, N1LO Projects -- 17M and 20M Via KD6WD 2m/440 -- Roger K6XQ advises - Can I build a 2m/440mhz 5/8A 1/4 wave on 144 MHz is 3/4 wave on 440. The SWR is usually acceptable on the 3rd harmonic, although that is partly due to the increased feeder losses on 440. But SWR is not the whole story. radiator on 440 has radiation lobes that send some of your signal at high angles, not toward the horizon where you probably want it.

This is usually not so severe to make the antenna unusable, and may be considered a reasonable compromise for theA 5/8 wave antenna on 144 MHz is 15/8 waves on 440. If you do the simple math you will see that on 440 you will have almost a 2 wavelength antenna, which is becoming what we call a "long wire" on the HF bands. As you probably know, a long wire radiates with multiple lobes, the largest of which are toward the ends of the wire. In other words, most of your signal will be radiated up toward the sky. The reason for the coil in commercial dual band antennas is to phase the antenna currents so you actually end up with two colinear elements which both radiate at low angles, reinforcing each other and providing gain. Without the phasing coil you get multiple undesirable lobes. Also keep in mind that 5/8 wave is NOT a resonant length. There are several ways to compensate for the reactance at the base of a 5/8 wave radiator, the easiest being to add a small inductance in series which makes the antenna electrically equivalent to a 3/4 wave.

(3/4 wave is resonant, as you have already discovered). Given that the gain advantage of a 5/8 wave antenna over a 1/4 wave antenna is probably not noticeable except under the most difficult conditions, and even then may or may not make a difference, my suggestion is to stick with the 1/4 wave antenna. tf2 backpack mutated milkIt is simple and works OK.icarly backpack target I- Near Vertical Incident Skywave Antennas -- Bystihl br 350 backpack blower price Patricia Gibbons - WA6UBEps4 backpack rocketfish NVIS II - Nearsamsonite spectrolite laptop backpack 16 expandable black

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pointer on the knob allows me to tune the variable capacitor while keeping my capacitive hand sufficiently away from it. I was pleasantly surprised how tolerant this design is to dimensionsI was concerned RG-6 coax would not be thick enough. Turns out 1/4 inch diameter RG-6 gives me 70kHz bandwidth on 20 meters (from SWR 2.0 to 2.0). I've read articles on larger diameter material use that provided less bandwidth. This antenna tunes from 7.94MHz to 19.84MHz at SWR 2.0 or less. Covers 17m, 20m, and 30m bands. If you're going to build one, be sure to visit: Projects You Can Build on any image for a larger view. & UHF Ground Planes & UHF Fox Hunters 2 Meter Phased Array Element, 2 Meter Yagi Band RF Field Strength Meter / 80 Meter Dipole or 17M Dbl. Ext. Zepp a 4:1 Coaxial Balun Revised Lighthouse Quad-Band Special Loaded 40 Meter Short DipoleEA5YC - Amateur Radio From Spain Meirion Amateur Radio Society (Dolg ...

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