This is rarely a problem, because the antenna is used at frequencies where there are high levels of atmospheric radio noise.

Chlorophyll d uses light at near-infrared rather than visible frequencies.

Coaxial cables are commonly used at audio frequencies and above for convenience.

FM is also used at audio frequencies to synthesize sound.

Additionally, point-to-point networks can use significantly more power even at normal frequencies, or could just go directly to optical connections.

Nevertheless, it can be used at lower frequencies (kilohertz) or higher (microwave).

Some bats are known to use clicks at frequencies above or below moths' hearing ranges.

Analog frequency dividers are less common and used only at very high frequencies.

Using multiple transmitters at different frequencies and locations, a dense data set in Fourier space can be built for a given target.

Thus, careful analysis, using measurements at several frequencies, can subtract this source of error.