Under Part 107, a Remote Pilot-in-Command cannot fly an unmanned aircraft higher than 400 feet above ground level (AGL), unless it’s flown within a 400-foot radius of a structure and does not fly higher than 400 feet above the structure’s immediate uppermost limit.

So if there’s a 1,200 ft. telecommunications tower, you can inspect it with your UAS, as long as you’re flying within 400 ft. of the tower both horizontally and above its highest point at all times. If flying above a structure means you will be entering controlled airspace, be aware of that fact and follow air traffic control (ATC) procedures, which we cover in other lectures.