What is the minimum base of the cloud layer to fly to the top of the towers 4 NM east of Onawa (K36)?

To determine the minimum base of the cloud layer required to safely operate a UAS near structures, such as the towers located 4 nautical miles east of Onawa (K36), it's important to understand the vertical distance from those structures to maintain appropriate visibility requirements and avoid infringing on airspace regulations.

The correct answer is 792 feet Above Ground Level (AGL) because it considers the height of the towers as well as the required vertical separation from clouds to ensure compliance with FAA regulations. Typically, regulations require that a UAS must operate at least 500 feet below the base of the cloud layer and maintain a certain distance from towers based on their height.

In this scenario, the minimum cloud base must be above the tallest tower to avoid any potential obstructions or hazards while flying. Thus, determining that minimum base indicates that by flying at or above 792 feet AGL ensures safe operation and compliance while providing enough altitude for maneuverability around the towers.

The other options, although they may seem plausible at first glance, do not appropriately reflect the needed clearance or are either too high or too low in relation to tower heights and the required cloud separation distances. Thus, selecting 792 feet AGL effectively balances safety, regulation adherence, and operational