The AS-2259/GR antenna is designed to provide high-angle radiation to permit _____________ wave propagation.

The AS-2259/GR antenna is engineered specifically to provide high-angle radiation, which is essential for short-range sky wave propagation. In radio communication, sky wave propagation refers to the reflection of radio waves off the ionosphere back to the Earth, allowing signals to cover distances that exceed the typical line-of-sight capabilities. High-angle radiation improves the efficiency of this mode of operation for shorter distances, facilitating effective communication within the horizon's reach.

This type of propagation is particularly useful for tactical communication where quick, reliable transmission over moderate distances is needed without relying on long-range capabilities. While other modes such as ground and direct wave propagation exist, they focus on different aspects of radio signal transmission, making them less relevant in the context of short-range sky wave propagation. Thus, the design of the AS-2259/GR antenna aligns perfectly with the requirements for achieving effective short-range sky wave communication.