A structure in height that doesn't exceed what value when crossing in front appears to not interfere with antennas?

The value of 656 feet is significant because it is the maximum height at which structures are generally considered to not interfere with antenna operations. This is particularly relevant for the placement and functionality of both terrestrial and airborne communication systems, as structures above this height can introduce significant radio frequency interference and impact line-of-sight propagation for various communication links.

Understanding the importance of this height helps in designing Outside Plant networks, ensuring that installations around antennas remain effective. Designers need to take into account local regulations, air traffic, and specific communication requirements when assessing potential interference from nearby structures. Keeping structures within this threshold maximizes transmission clarity and maintains operational efficacy for communication systems. Recognizing this height requirement is fundamental for ensuring compliance and optimal performance in outside plant design.