Because VHF signals have a line of sight limitation.
VHF radios work by the line of sight principle
VHF radios work by the line of sight principle
The height of a VHF radio antenna is crucial because it affects the radio signal's range and quality. A taller antenna can enhance line-of-sight communication, reducing obstacles and interference, which is particularly important for VHF signals that travel via direct wave propagation. Additionally, the height can impact the antenna's impedance and radiation pattern, optimizing performance for specific applications.
Because VHF signals have a line of sight limitation.
history of vhf radio
You need a VHF radio antenna, a VHF radio receiver and of course a station broadcasting on the VHF frequency.
VHF is "line of sight" communication only, as the signal travels in a straight line (like visible light). A taller antenna will be able to "see further" over the horizon and thus have longer range.
The PRC77 radio operates on 30.000 to 75.95 MHz. If the Harris radio operates on any of the same frequencies (I know you said it's VHF, but VHF covers 30 to 300 MHz), then it can.
VHF is in the range 30 to 300 MHz.
The height of a VHF radio antenna on a boat is crucial for maximizing communication range and effectiveness. A higher antenna allows for a clearer line of sight, reducing obstructions from the boat's structure or surrounding obstacles, which can otherwise limit signal transmission and reception. Additionally, a taller antenna can enhance the ability to communicate over longer distances, especially in open water where other vessels or land might be far away. Overall, proper antenna height is essential for safety and effective communication while at sea.
VHF signals are essentially Line of sight transmissions (LOS). Like all radio waves they are attenuated by objects in their path. Raising the aerial above the level of the interferring objects while still maintaining an integral waveform (Usually using an artificial ground plane or aerials less than 1/2 lambna), reduces the attenuation and prevents distortion of the polarization pattern thus leading to an efficient transmission path.
Very High Frequency.