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...ultistatic|multistatic techniques]], mixing the signal with noise (i.e., [[spread spectrum]]), and a wide range of other methods.

...endly use of the [electronagnetic spectrum], such as frequency agility and spread spectrum in a radio, or variable radar#pulse repetition frequency|pulse repetition

...ervice, although pseudo-cryptographic methods such as frequency agility or spread spectrum radio can make it difficult to capture material even transmitted in the cle

Spread spectrum with noise injection into unused frequencies, frequency agility|frequency h

...t/detection (LPI/LPD) because off-the-shelf radios can be frequency agile, spread spectrum, and transmit in bursts.