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Unlike existing protocols such as Wi-Fi and Bluetooth, which cannot detect humans in scenarios where signals need to pass through multiple walls [10], the 433 MHz frequency band operates at a lower frequency, making it more suitable for long-range communication and more effective at penetrating obstacles.

Anyone transmitting on that frequency without holding a valid amateur radio license is in violation of Federal Communications Commission (FCC) rules and is subject to hefty fines if caught. The FCC doesn't drive up and down streets trying to detect transmissions of a few miliwatts on 433 MHz so it can dish out a fine.

VHF (Very High Frequency) frequency band UK Business VHF Radios use frequencies from 136 - 174MHz. "Marine band" VHF radios used on ships and to communicate between vessels and harbours, bridges, locks etc, use frequencies between 156 - 162MHz.

VHF high band (130 -174 MHz) and UHF (400 - 512 MHz) are the frequencies most commonly used for security purposes.

433 MHz. This band is mainly used in Europe. It can be used in the USA, Japan, Korea, and a few other countries, but these countries have restrictions and regulations on it. This frequency may have some interference when operating in larger networks.

2 Answers. So it is a reserved band for goods/container identification. Unless this is what your radio is doing, you cannot use this band without a license (as is the case of radio amateurs also using the band).

The bands within the tuning range of the VLA which are specifically protected for radio astronomy are: 73.0-74.6 MHz, 322.0-328.6 MHz, 1400?1427 MHz, 1660.6?1670.0 MHz, 2690?2700 MHz, 4990?5000 MHz, 10.68?10.7 GHz, 15.35?15.4 GHz, 22.21?22.5 GHz, 23.6?24.0 GHz, 31.3?31.8 GHz, and 42.5?43.5 GHz.