Physics education research, electronic materials, and the musings of Christopher Moore, Ph.D.

Fresnel zone radius calculation?





this is a bit hard for me to find out the calculation


30 miles between HQ and Intermediate radio station.
19 miles between Intermediate radio station and Harbour Master Building.

So, from HQ to Hardbour Master Building is 30miles + 19miles = 49miles

The Forest is 15 meters Height.

What is the appropriate antennae heights




Please Help me Out