A cell site is a low power transmitter with an antenna capable of transmitting radio waves to mobile phones. The reason why the antennas have to be positioned so high on tall masts is because radio waves travel in straight lines and can be deflected or interrupted by buildings or terrain. The antenna transmits radio frequencies allowing us to make calls on a network with our mobile phone – which is also fundamentally a radio transmitter. Macrocells provide additional coverage in areas with a higher number of users such as urban and suburban areas. These Macrocells are usually mounted at street level and are more subtle looking than the larger “mast” cell sites.