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I have a 3 element vertical Yagi mounted on a rotator, and in one direction the roof of the house gets pretty close and messes up the SWR a bit.

If i mash up a few type 43 material ferrite cores and mix them in some paint and paint the roof near my Yagi with that, will that make the roof 'invisible' to my Yagi?

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    $\begingroup$ Apparently, ferrite paint is a thing (Google ferrite paint). But how it is mixed -and with what- likely will affect its RF properties. $\endgroup$ – Mike Waters♦ Mar 15 '19 at 1:42
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    $\begingroup$ I'm also very confused why changing the electromagnetic properties of your roof to be more like a ferromagnetic metal surface would make your invisible to your yagi? I mean, this is not even a gross simplification: Metal close to any antenna changes the antenna. Non-conductive, non-magnetic material: usually not as much of a change. What do you mean with "invisible"? $\endgroup$ – Marcus Müller Mar 15 '19 at 19:18
  • $\begingroup$ @MarcusMüller i guess then the answer to my question is no :( $\endgroup$ – Andrew Mar 17 '19 at 2:37
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No. At best it will do nothing; if it did something, it would probably turn your roof from a relatively good reflector (which may mess with your SWR, and may distort your pattern, but the energy that doesn't go where you expected it at least goes somewhere) to a relatively bad reflector (which absorbs energy from your antenna and turns it into heat — ferrites are lossier than metals, and whatever you do to make it into "paint" will almost certainly increase that). What it won't do is make your wall RF-transparent.

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