How do I block radar waves?

In small quantities, rubber, cotton, wax paper, and plastic wrap are unlikely to interfere with radio waves. However, because copper and other electrically conductive metals, like aluminum foil, may reflect and absorb radio waves, they interfere with transmitting those signals.

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Can radar detect small boats?

Protecting port facilities from waterborne invaders, including surface swimmers, manually-propelled watercraft (such kayaks and rafts), and small motorized boats, is possible with small boat incursion detection systems with radar capabilities.

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