This happens both ways, and makes it possible for the two people to communicate even though there is a large obstruction between them. Now, when one of the people sends a message to the other, the radio wave first goes to the station, and is sent back out to the other two-way. Now imagine a large tower standing on the top of the hill, with a large antenna sitting on top of it. They each have a two-way radio, but cannot talk to one another because the hill is obstructing the waves being transmitted from and to each radio. To give you an example, picture two people standing on opposites sides of a hill. Many towers or masts are also set far away from inhabited places depending on government regulations. Most stations are high above the ground to meet line of sight criteria. By raising stations and masts, the line of sight of waves are increased, making the waves receivable for longer distances. These obstructions can bend, reflect or absorb the waves and render them useless past the point of the obstruction. In many instances, waves do not travel to the horizon due to objects such as hills, buildings, trees or even the atmosphere. These waves, without obstructions, can typically travel from the origin, to the horizon, but not past it. In regards to electro-magnetic radiation, line of sight refers to waves traveling in a straight line. Line of sight and power are always considered. Their locations are selected based on a number of things. They are used to transmit radio waves for cell phones, two-ways, AM/FM radio, and microwaves. Transmitter stations are large spires or masts that can be constructed by themselves or on top of tall buildings. Whereas family radios can mostly only travel short distances, a two-way that works with a repeater can send and receive messages from many miles away, making communication on different work sites quick and clear. These stations receive and send radio waves, and can increase the distance that these waves are sent by many miles. This is how our Wide Area Network functions. Here at Highland we use repeaters, or transmitter stations, to send out radio signals on two-ways.
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