Md116
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I am no expert on antennas by any stretch but what does adding a GP to a NGP antenna accomplish? If anything at all?
Adding a ground plane for a NGP mobile antenna.
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A bit of a shield from directional RFI.
prcguy
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Adding a ground plane will probably improve the radiation pattern at the horizon. A no ground plane antenna, usually a half wave, is designed to have a good match without a ground plane but in most cases the radiation pattern is compromised and the only way to fix that is with a ground plane.
mmckenna
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^^^ What he said.
Improving the radiation pattern at the horizon tends to take a half wave antenna from 0dB of gain to around 2dB of gain by focusing the radiation pattern more towards the horizon.
Improving the radiation pattern at the horizon tends to take a half wave antenna from 0dB of gain to around 2dB of gain by focusing the radiation pattern more towards the horizon.
I use a Diamond NR770HB NGP antenna on top of my vehicle mounted to a motorized mount. It is located on top in the middle which helps. Additionally, when I pull into a full parking lot with vehicles around me in the direction of the signal, it definitely improves my TX/RX toward the horizon.
Without counterpoise (radials) you have an end fed antenna rather than a dipole.
1/4 wave in a ground plane has a slight gain 1/2 wave in end fed has a slight gain.
What this does is lower the radiation angle more to the horizon.
1/4 wave in a ground plane has a slight gain 1/2 wave in end fed has a slight gain.
What this does is lower the radiation angle more to the horizon.
A motorized mount on a whip ??? Makes no sense.
I find that it makes a lot of sense when I lower the antenna and park in my garage, or pull into a parking garage, etc. as I have an SUV. I know crazy right? Actually using a garage for a vehicle instead of storing boxes of stuff in there instead.
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