Trim a short piece on the short side, and a proportionately longer piece on the long side). Mast and wire support 01 – Tee Antenna. The 17 meter wire will pass through the spreader at 2.86. As PVC is used no additional insulators are needed with low to medium power. Although the cable is direct bury rated, I buried it in PVC conduit for extra protection and easier replacement should the need arise. This makes the antenna usable on 5+ bands without a tuner. … We greatly appreciate your support to help keep this blog up and running! Below two versions of the baluns I use. This makes them well suited for working DX, provided attention is paid to the ground around them. A One-Time Donation (You choose the amount): A $5 Dollar bill, a €5 Euro bill, a few Pre-1965 silver dimes, or a booklet of “Forever” U.S. postage stamps sent in the mail also works! Actual antenna length can vary significantly depending on elevation above ground, ground conditions, nearby objects, et cetera. The third antenna will probably be a multiband version of these antennas (or yagi). While primarily designed for the 80/40/20 meter bands, this antenna also works on 17/12/6 meters. A probably better way is to use a kind of thickening of the wire (using a luster or screw terminal over the wire). I filled the plugs with STUF (STUF connector seal– a polyethylene paste to seal out contaminants and moisture), prior to tightening them to the socket. All hardware was stainless steel. The center support and balun were installed on top of the telescoping fiberglass mast at 26 feet using four DX engineering telescoping fiberglass mast sections (8 feet each) and their hose clamp mast kit (could not afford more mast after buying my retreat!). First I tried to build a Cobwebb antenna. ZS6BKW / G5RV Optimized Multi Band HF Dipole Antenna Poly-Stealth. My primary reason for wanting a vertical was to work a bit more DX, taking advantage of the low angle takeoff offered by vertical antennas. He is also a retreat consultant specializing in off-grid living, rural relocation, and survival preparedness. In the spreader tubes holes are drilled to pass the wires through. The mast should not be to flexible. For SHTF communications, stay away from complicated things and keep it simple (KISS). I loosely attached the wire ends with Dacron rope and pulleys to the end supports to allow trimming the ends as necessary. All antenna … All antenna wires are all attached to one side of the balun and attached to the center pin of the coax cable. Dipole. Running 500+ watts through a tuner into a coax fed system with an SWR of 15 will most likely arc in the connectors or turn your tuner, amplifier, or balun into a toaster. Since the antenna read a low SWR on 2 meters, I gave it a quick test with my 2m HT and a VHF SWR meter. I was running 20 watts out on my portable radio. 69-70. The other week I was casually researching how to make a multi-band vertical for the HF bands, initially I was thinking of a single length of wire, with traps, to separate the bands. ), Some cheap wire as antenna and radial wire. Transformer is a 1:49 or 1:64 UnUn (not 1:4 or 1:9 used on random wire antennas) 50 Ohm Coax from transformer to station Multi-Band (works on all harmonics) Deploy it … This is what I used for the antenna. Example antenna for 20-15-10 meter (High HF bands), Example antenna for 40-20-15-10-6 meter (40 + High HF bands + 6 meter). Build your own Wire Antenna! Although the antenna is designed for the 40 meter and 20 meter bands, it … The wire is allowed to slip through the holes of all additional support spreaders in between. I like to experiment with antennas and have built many dipoles for the various bands. Trees, lumber, bamboo, rope, old utility poles, pipe, chimneys, or other objects will work, as long as it gets the antenna up in the air. The 20 and 15 meter wires are using the same spreaders. WDRB-DT, LOUISVILLE, KENTUCKY PAGE 1 1Of a design that meets industry acceptance offered by major domestic antenna manufacturer 2Consideration was given to panel antenna which while offering wideband capabilities have pattern undulations and are inherently require more maintenance over the life of the antenna. A SWR higher than 2, directly connected to most radios will cause the radios protective circuit to reduce power. The initial, center band SWR readings with an MFJ259B were 80m/1.8, 40m/1.6, 20m/1.5. I decided to sweep the completed antenna through the entire frequency range, all the way to 2m (148mhz), although the balun is only rated to 50Mhz (6m). It now reaches more than 320,000 unique visitors weekly. Guying He began SurvivalBlog in 2005. The PL-259 plugs were installed by screwing them over the straightened and folded back shield, as shown (and also on YouTube. Below a picture of the antenna on the back of our barn. The 15 meter wire will pass through the spreader at 2,43 meter. This is an excellent antenna if you have to use coax and can’t use parallel line and a tuner. The pressure treated end supports (brown) and light blue wire blend in with the surrounding environment and are almost invisible. NOTE: Now shipping with the new flexible DX10 antenna … Dipole. Thanks to W4AOX for this simple and helpful tutorial on how to design, build, and use a multi-band HF antenna. Please support this website by adding us to your whitelist in your ad blocker. Even though the antenna is low to the ground, with the center at 26’ (almost NVIS), it still appears to have good long range capabilities, even at the lower frequencies. Free Targets and Target Tracker Shooting Logs! Please let others know they too can trust SurvivalBlog for the most reliable and practical survival information by voting for SurvivalBlog on topprepperwebsites.com. To my surprise, there was very little noise and static compared to the old vertical I had in the Golden Horde EBT Empire (big city). For added reliability I added marine grade, adhesive lined heat shrink tubing at the cable to plug connection. Each end support is located 90’ from the center support (in case the OCF didn’t work and I needed to revert to a dipole). 02 – Half-Lamda Tee Antenna ... 37 – Multi-Band Portable Antenna. The center wire will always be the lowest band and to the sides the other two or four bands. This article describes how I built a multiband OCF antenna, including the actual dimensions, measurements, and some performance information. The easiest is to place the mast on a pole and slope the radials to all sides to ground poles/pins (of course isolated to ground). DX Commander Premium Build – HF Multi-Band Vertical System. 33 foot 10-80 meter multiband foldover vertical antenna with unun view details; 43 foot 10-160 meter multiband foldover vertical antenna with unun view details; heavy duty foldover mount for any mast mounted vertical antenna view details; 20 foot 6-30 meter high performance commercial duty flagpole antenna … The top of the wire can be fixed the same way on the top spreader as on the bottom spreader. See pictures below. This antenna definitely works! As it bends, the centre mast will not change length much. An alternative is to double the mast length and also use spreaders for the radials below the feed point. When the center tube is very flexible it is probably wise to use some king of flexible material so the wires can slide through the holes in the spreader tubes and only fixed to the spreaders at one point. A good quality balun (transmission line transformer – BALanced to UNbalanced) is required for the antenna to work properly and to match the impedance, which is higher than that of a resonant dipole. Then you are in luck if you want to build a cheap "6" band HF vertical antenna… A remote tuner was also out, since it added a potential point of failure. Penetrox or Alnox will work just as well. “Force feeding” a high SWR, coax fed system with a tuner can create very high voltages, heat, potential arcing, and stress components like the balun, coax, and tuner. 4.9 out of 5 stars 25. MFJ-1699T 10-Band HF/VHF 80 Thru 2M Mobile Antenna with 3/8-24 Connector, Handles 200W ... CP-5H CP5H Diamond 40m/20m/15m/10m/6m HF Five-Band Trap Vertical Antenna … This article describes how I built a multiband OCF antenna, including the actual dimensions, measurements, and some performance information. In a pinch, wires can be tied in a knot to splice them. 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