Find the expression for coverage distance and height of transmitting antenna.

Explanation

To find the expression for the coverage distance and height of a transmitting antenna, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Setup**:
- Draw a diagram with the Earth as a flat surface.
- Mark the height of the transmitting antenna as \( h \) and the radius of the Earth as \( r \).
- Let \( O \) be the center of the Earth, \( A' \) be the top of the antenna, and \( B \) be a point on the surface of the Earth where the signal reaches.
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