Does VHF use AM or FM?

As others have said, VHF refers to a frequency range. It’s true that most transmissions on VHF happen to use FM, which includes the FM broadcast band and 2-way mobile radio systems, And it’s true that the VHF aircraft band uses AM . But NTSC analog TV also used a form of AM known as “vestigial sideband”.9 Ara 2019

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What frequency can penetrate walls?

Radio frequency is easier to generate and because of its large wavelength it can penetrate through walls and alike structures. Radio waves can have wavelength from 1 mm – 100,000 km and have frequency ranging from 3 Hz (Extremely Low Frequency) to 300 GHz (Extremely High Frequency).

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