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I have an ETS Lindgren 6511 loop antenna that lists a magnetic antenna factor of -2.5 (best I can read the graph) at our frequency of interest.

I've found lots of information on establishing a given electric field, but nothing that speaks specifically to magnetic fields.

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  • \$\begingroup\$ If you have the electric field, you can calculate the magnetic field directly from it. Refer Antenna Design by Balanis, or Electromagnetism by Griffith. Check electromagnetic waves section. \$\endgroup\$ – niki_t1 Mar 1 '17 at 14:45
  • \$\begingroup\$ I don't have access to a copy at this time. I can order it, but surely there is a web page somewhere that has the formula? \$\endgroup\$ – user121934 Mar 1 '17 at 16:01
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If you already have the electric fieldstrength, the rest is easy. The ratio of the electric and magnetic fieldstrength is called the impedance of free space its value is approximately 377 ohms.

So approximately: $$H = { E \over 377 } $$ H and E are the moduli of the respective field vectors.

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