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They work great if one station is up high in the clear on a mountaintop talking to somebody down in the valley below, but if you are inside your car talking to somebody else in a convoy, do not depend upon hearing each other if you cannot actually SEE the other car. Portable ham rigs do much more than direct unit-to-unit simplex.
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If the receiving station were standing on top of a 250 foot hill the line of sight range would be about 20 miles.
The highest point of any MURS antenna is not allowed to be more than 60 feet above the ground or 20 feet above the highest point of the structure on which it is mounted.
Around cities you will hear fast food drive-in windows, warehouse operations, trash collection, building maintenance and construction site crews.
The wide-band FM channels 154.57 and 154.60 get more use than the 151 Mhz. MURS operation is authorized anywhere a CB station is authorized.
Using a 6d B gain vertical antenna, at maximum legal height, fed with low loss coax such as LMR400 on your home base, and having a 3d B gain 5/8 wave mobile antenna mounted on the roof of your vehicle, having a good ground plane, you can work mobile-to-base simplex from 10-20 miles, depending upon terrain.
The frequencies available in the Multi-Use Radio Service are: Frequencies Authorized Bandwidth 151.820 MHz 11.25 KHz 151.880 MHz 11.25 KHz 151.940 MHz 11.25 KHz 154.570 MHz 20.0 KHz 154.600 MHz 20.0 KHz Multi-Use Radio Service transmitters must be certificated in accordance with Part 95, Subpart J of the Commission’s rules.
The channels authorized are available on a shared basis only and may not assigned for exclusive use of any entity.
Users must cooperate in the selection and use of channels in order to reduce interference and avoid interference to other MURS transmissions.
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This all comes under the general heading of that the FCC calls “good operating practice.” It is common sense and courtesy.