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Do red bricks home/building and aluminum insulation diminish the strength of radio signals?

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Yes, of course, for some types of "bricks", some ranges of frequencies, and some values of "diminish". Just about everything absorbs or reflects some frequencies accross the radio spectrum.

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  • \$\begingroup\$ Doesn't aluminum block EM waves much more than "less" conductive materials like bricks ? \$\endgroup\$ – Mike Sep 19 '14 at 14:06
  • \$\begingroup\$ Depends on the frequency. If you make the Al thin enough you can get some light through it... you can't see through a brick. :^) (I'm talking about very thin Al ~10's of nanometers.) \$\endgroup\$ – George Herold Sep 19 '14 at 14:30
  • \$\begingroup\$ If you make a brick thin enough you can see through it. \$\endgroup\$ – John U Sep 19 '14 at 15:06
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    \$\begingroup\$ @JohnU If you make a brick thin enough to see through, is it still a brick? :) \$\endgroup\$ – JYelton Sep 19 '14 at 17:37

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