Establish a relation between coverage distance and height of transmitting antenna.

Explanation

To establish a relation between the coverage distance (D) and the height (H) of a transmitting antenna, we can follow these steps:

### Step 1: Understand the Geometry
Consider a transmitting antenna at height \( H \) above the Earth's surface. The radius of the Earth is denoted as \( R \). The total distance from the center of the Earth to the top of the antenna is \( R + H \).

### Step 2: Draw the Right Triangle
Visualize a right triangle formed by:
- The line from the center of the Earth (point O) to the top of the antenna (point A').
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