Although the principle is right, I doubt your method would work, though I have used myself the aluminium foil hat method (
https://en.wikipedia.org/wiki/Tin_foil_hat), and applying an electric field of various frequencies to my brain. The method I am particularly interested in these days is going into the Channel Tunnel, between England and France (
https://en.wikipedia.org/wiki/Channel_Tunnel), though I should visit my dentist(s) too

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Distance effects have, as far as I know, never been found in telepathy. This means that getting rid of these waves is hard. Even if your system can attenuate the waves, reduce their intensity, you won't be able to eliminate them completely (even for a portable radio, or a smartphone nowadays).