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2. Land mobile radio system - Wikipedia

   en.wikipedia.org/wiki/Land_mobile_radio_system

   Land mobile radio systems use channels in the VHF or UHF bands, since the antennas used at these short wavelengths are small enough to mount on vehicles or handheld transceivers. Transmitter power is usually limited to a few watts, to provide a reliable working range on the order of 3 to 20 miles (4.8 to 32 km) depending on terrain.

3. Radio repeater - Wikipedia

   en.wikipedia.org/wiki/Radio_repeater

   A radio repeater is a combination of a radio receiver and a radio transmitter that receives a signal and retransmits it, so that two-way radio signals can cover longer distances. A repeater sited at a high elevation can allow two mobile stations, otherwise out of line-of-sight propagation range of each other, to communicate. [1]

4. Mobile radio - Wikipedia

   en.wikipedia.org/wiki/Mobile_radio

   The most common antennas are stainless steel wire or rod whips which protrude vertically from the vehicle. Physics defines the antenna length: length relates to frequency and cannot be arbitrarily lengthened or shortened (more likely) by the end user. The standard "quarter wave" antenna in the 25-50 MHz range can be over nine feet long.

5. Professional mobile radio - Wikipedia

   en.wikipedia.org/wiki/Professional_mobile_radio

   They use channels in the VHF and UHF bands, giving them a limited range, usually 3 to 20 miles (4.8 to 32 km) depending on terrain. Output power is typically limited to 4 watts. Repeaters installed on tall buildings, hills or mountain peaks are used to increase the range of systems.

6. General Mobile Radio Service - Wikipedia

   en.wikipedia.org/wiki/General_Mobile_Radio_Service

   Theoretically, the range between two hand-held units on flat ground would be about one or two miles (about 1.5–3 km). Mobile units might have a slightly farther range when mounted on a car roof. A GMRS repeater with an antenna mounted high above the surrounding terrain can extend the usable range to 20 miles or more (30+ km) depending on height.

7. Personal radio service - Wikipedia

   en.wikipedia.org/wiki/Personal_radio_service

   Norway has a 6-channel VHF FM Jaktradio (Hunting Radio) service, maximum power 5 watts. Because both Norway and Sweden have high-band VHF FM hunting allocations (see section on Sweden below), many hunting radios are marketed with both the 6 Norse channels and 7 Swedish channels in one unit. 143.900 MHz; 139.400 MHz; 143.350 MHz; 138.850 MHz