What is the typical effect of increasing the height of an antenna?

Increasing the height of an antenna typically results in increased gain because a higher antenna can more effectively radiate signals over greater distances and can receive signals from further away. This is primarily due to the reduction of the ground's attenuation effect, allowing for a clearer line of sight and improved propagation.

When an antenna is elevated, it can also take advantage of a larger portion of the radio waves that are above the ground, which can enhance its ability to transmit and receive signals. This increased gain translates to superior performance, particularly in VHF and UHF bands where line-of-sight is critical for effective communication.

Other factors, such as decreased signal interference, can also be influenced by antenna height, but the primary effect is that the antenna can more effectively interact with the radio waves due to improved height. However, the essential point is that increased antenna height directly correlates with increased gain rather than the other options listed.