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MFJ Field Strength Meter, 2M/440

MFJ Enterprises, Inc.

MFJ-801 by MFJ Enterprises, Inc.


The MFJ-801 Field Strength Meter is ideal for reading relative field strength from your antenna.

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The MFJ-801 is so small that that it fits in the palm of your hand. The best part of using it is that you now can tell if your antenna is radiating or not by simply holding the unit near your antenna and adjusting the sensitivity. Futhermore, by taking measurements, you can find out relatively how strong your antenna field is.

This easy-to-use MFJ-801 antenna meters show the strength of the actual field being radiated from your antenna.


  • Determine the basic radiation pattern of your antenna and see which direction your signal is strongest.
  • Make changes to your antenna and instantly know if it radiates better or worse.
  • Compare one antenna to another find out which HT antenna radiates the strongest signal.
  • Measure your HF antenna now and compare it later to make sure its performance is still up to par.
  • Adjust a ground lead, artificial ground, counterpoise or tune your transmitter or antenna tuner for maximum field strength.
  • Check for RF floating around the shack that may be caused by faulty antennas or poorly shielded equipment.
  • Demonstrate the concept of gain or antenna polarization.
  • Find hidden transmitter bugs at office or house!
  • Usable from 100 kHz to 500 Mhz.

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