Bandwidth, Beamwidth and Range

Hye all,

I would like to ask about the relationship between the bandwidth, beamwidth of antenna with the range or distance that the antenna can operates. For example, the bandwidth of 200MHz can be used for 120meters...how they relates? anyone knows? .TQ

Your question is simply wrong.

A communication SYSTEM is composed of a transmitter with a specified power, a transmitting and a receiving antenna, and a receiver with its specifications.

System bandwidth is mainly defined by the receiver but also by the modulation used.
Antenna beam width is a function of its aperture in wavelengths; in a system, antenna gain is important.
A distance covered by such SYSTEM is defined by POWER BUDGET; in it, the transmitter power, antenna gains and receiver signal-to-noise ratio are all important.