What is the preferred standard for antennas installed on building rooftops?

The preferred standard for antennas installed on building rooftops is a clearance of 3 feet. This measurement is crucial because it helps ensure both safety and functionality. A 3-foot clearance provides sufficient space to prevent interference with surrounding structures and allows for effective signal propagation. This measurement also helps to minimize hazards from wind or other environmental factors that could disturb the antenna's position or integrity.

Additionally, maintaining this standard clearance helps to comply with safety regulations and local building codes, reducing the risk of accidents due to falling debris or maintenance activities. Overall, this guideline is essential for the optimal performance and safety of rooftop antennas in various applications, including communication and broadcasting.