What is the minimum base of the cloud layer to fly to the tops of towers located 4 NM east of Onawa?

To determine the minimum base of the cloud layer required to safely fly to the tops of towers located 4 nautical miles east of Onawa, we need to consider both the height of the towers and the regulations regarding cloud clearance.

In general, the Federal Aviation Administration (FAA) requires that a pilot maintain visual flight rules (VFR) and avoid flying through a cloud layer when operating outside of those parameters. When flying in visual flight conditions, the pilot must remain clear of clouds to ensure safe visual navigation and separation from other aircraft.

The height of the towers would play a crucial role in this calculation. Assuming the tower height is known or provided, you would add a buffer of vertical clearance, typically 500 feet or more depending on the specific situation and regulations. If the tower, for example, is approximately 300 feet tall, then the cloud base should be at least 800 feet above the ground level (AGL) to provide the necessary clearance above the tower and to meet VFR requirements.

Given that the selected answer is 792 feet AGL, this is likely grounded in ensuring that the pilot can safely operate their UAS while maintaining the necessary vertical separation from the tower, factoring in the height of the structure and any required safety margins.