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I compared RSSI of several antennas including this one I found laying around:

Unknown Antenna

It performed from all angles about 10 dB better than for example the quarter wave ANT-433-CW-HD-SMA (Mouser Link).

Tests were performed without a groundplane.

Is this a no-groundplane antenna? Can anyone find out the name or producer of the antenna? If not, does someone know of similar antennas?

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  • \$\begingroup\$ Does this antenna require a power source? \$\endgroup\$
    – glen_geek
    Commented Mar 21, 2022 at 14:45
  • \$\begingroup\$ No, I don't think so. \$\endgroup\$
    – PlzBePython
    Commented Mar 21, 2022 at 14:56
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    \$\begingroup\$ At 88mm, selling the ANT-433-CW-HD-SMA as a "quarter-wave whip" is a blatant lie. It's 1/8 wavelength long including radome, and presumably less than that internally. It's a normal-mode helical whip ("rubber duck"). \$\endgroup\$
    – hobbs
    Commented Mar 21, 2022 at 16:01
  • \$\begingroup\$ Suggest you right click on the image, the search with Google Lens - it found several similar antennas available. Good luck. \$\endgroup\$
    – Larry_C
    Commented Mar 21, 2022 at 18:58

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It does not appear to be a no-groundplane antenna, you can see a threaded hole where a ground plane radial would screw in. They come out at around a 45 degree angle and there is usually 3 or 4 of them.

It appears to be a quarter wave ground plane, basically a quarter wave vertical radiator with several grounded radials at the bottom. You can measure the radiator length to get an idea of what frequency it is for.

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  • \$\begingroup\$ Nice catch with the screw holes for the ground plane radials, thanks! By length, it could very well be a quarter-wave antenna for the 70 cm band. \$\endgroup\$
    – PlzBePython
    Commented Mar 22, 2022 at 9:53

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