Construct a vertical ground plane with one vertical element, and two radial elements, from readily available parts. 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. Stay tuned for upcoming posts. The antenna is simulated over "real" ground of "medium" conductivity (Sommerfeld model), with the lower set of elevated radials .05 $\lambda$ above ground and .01 $\lambda$ vertical separation between the radial sets to prevent shorts. For vertical antennas with an impedance greater than 50 ohms you will need a step up impedance transformer (e.g. Proper Antenna Grounding - posted in Technical Discussion: OK, being new to base station and repeater building I have a very important question. The ground stake near the house provides a place for the common mode noise current to go, far from the antenna where it cannot couple significantly. For vertical antennas with a feed point impedance less than 50 ohms, you will need a sub-ratio impedance transformer (e.g. 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. To raise 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. 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. 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 … 100 ohm load to 50 … 25 ohm load to 50 ohm coax, also know as a 1:2 unun). x 7.5 in. To explain my setup: I will be installing a gable antenna mount which has a 6 extender pole on my single story home. As more radials are added the impedance of the antenna drops, over perfect ground a vertical is 36 ohms. It is possible to simulate this function by replacing the real earth with a conducting plane. The antenna … Using the threads, I could then mount another water pipe to it using a threaded coupler, and then mount the antenna … 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. To function as an antenna ground plane… 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 … Note, however, that, For best performance, the ground plane antenna should be isolated from the tower structure. You should be able to… 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. A single band 1/4 wave ground plane vertical antenna can be installed atop a tower. What is the best way to ground a fiberglass antenna? You should use an RF choke balun in the transmission line to prevent RF from traveling back to the radio shack over … You should have a 1.5 SWR on this. More engineering would have to be done to result in a practical design. antenna) was used commonly in amateur and commerical antenna systems for more than 10 years. 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