*Question T0B06:
What is the minimum safe distance from a power line to allow when installing an antenna?*  

*Correct Answer is  D: Enough so that if the antenna falls, no part of it can come closer than 10 feet to the power wires*  

### AI Response: (may contain errors)  

To determine the minimum safe distance from a power line when installing an antenna, the correct answer is:

**D: Enough so that if the antenna falls, no part of it can come closer than 10 feet to the power wires.**

### Explanation of the Correct Answer:
- **Safety First**: The primary concern when installing antennas near power lines is safety. If an antenna were to fall, it could potentially come into contact with the power lines, leading to dangerous situations such as electrical shock or fire.
- **10 Feet Rule**: The 10-foot clearance is a standard safety guideline that helps ensure that even in the event of an accident, the antenna will not come dangerously close to the power lines.

### Why the Other Choices are Incorrect:
- **A: Add the height of the antenna to the height of the power line and multiply by a factor of 1.5**  
  - This method does not provide a specific safety margin for the falling antenna. It is not a recognized standard for ensuring safety around power lines.

- **B: The height of the power line above ground**  
  - This option does not account for the potential movement or falling of the antenna. Simply knowing the height of the power line does not ensure safety.

- **C: 1/2 wavelength at the operating frequency**  
  - While this distance may be relevant for other considerations in antenna placement (like resonance and radiation patterns), it does not address safety around power lines. The 10-foot rule is specifically designed for safety.

### Useful Rules of Thumb:
- Always maintain a minimum distance of 10 feet from power lines to ensure safety.
- When planning antenna installations, consider the height of the antenna and any potential for it to fall, ensuring that it will not come within the 10-foot clearance of power lines.

By following these guidelines, you can ensure a safer installation of your antenna.