element to boom plate 2 DX-Engineering DXE-SAD-075A 3/4 inch saddle clamps 4 DX-Engineering DXE-CAVS-2P 1.5 inch saddle … Simple CB Base Station Antenna: This is a simple base station CB antenna You can make in 30 minutes out of a bit of PVC pipe and fittings, some wire and a SO239 coax connector and a piece of coax to connect it to your radio. In this case, it’s a multi-band antenna the customer is using (it can be used from 700 MHz – 2700 MHz) so the ground plane required could be anywhere from 4 … The amount/size of the “ground-plane” required for the optimal performance of a monopole antenna is determined by the frequency you are transmitting/receiving at. This is pretty much the system I used for my 43-foot ground mount vertical. For vertical antennas with a feed point impedance less than 50 ohms, you will need a sub-ratio impedance transformer (e.g. What is the best way to ground a fiberglass antenna? x 7.5 in. You should have a 1.5 SWR on this. To raise 25 ohm load to 50 ohm coax, also know as a 1:2 unun). antenna) was used commonly in amateur and commerical antenna systems for more than 10 years. It is possible to simulate this function by replacing the real earth with a conducting plane. As more radials are added the impedance of the antenna drops, over perfect ground a vertical is 36 ohms. If you put up a vertical with a poor radial system you usually get a good match because the ground LOSS adds to the 36 ohms to get you at or near 50 ohms, but with a big drop in signal strength. A single band 1/4 wave ground plane vertical antenna can be installed atop a tower. It sets up in about 20 minutes – so make sure that mounting pipe is straight up and down so the antenna won’t be leaning. x 11.5 in. Using the threads, I could then mount another water pipe to it using a threaded coupler, and then mount the antenna … Proper Antenna Grounding - posted in Technical Discussion: OK, being new to base station and repeater building I have a very important question. 1 EX-Engineering DXE-MMP-P2 polymer plastic 25 in. To function as an antenna ground plane… To explain my setup: I will be installing a gable antenna mount which has a 6 extender pole on my single story home. Stay tuned for upcoming posts. You should be able to… Note, however, that, For best performance, the ground plane antenna should be isolated from the tower structure. Construct a vertical ground plane with one vertical element, and two radial elements, from readily available parts. The antenna … As the counterpoise was developed, its usual configuration became a symmetrical pattern of radial wires used as the "artificial ground" under electrical- ly short (one quarter wavelength or less) vertical antennas, as … It is found that for a monopole antenna like a quarter wavelength vertical, the ground acts as a plane to reflect the radio waves so that an image of the top half of the antenna is seen in the Earth. The ground stake at the base of my inverted-L antenna provides a place for the antenna current to flow, at a true ground potential relative to the antenna potential. For vertical antennas with an impedance greater than 50 ohms you will need a step up impedance transformer (e.g. 100 ohm load to 50 … The final result is I have a new location for the antenna which is more XYL friendly, does not spoil the view of our sunsets and is ready to accept my new 43 foot antenna, ground radial installation and coaxial cable routing. 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