*Question G0A11:
What precaution should be taken if you install an indoor transmitting antenna?*  

*Correct Answer is  C: Make sure that MPE limits are not exceeded in occupied areas*  

### AI Response: (may contain errors)  

When installing an indoor transmitting antenna, it's crucial to ensure that Maximum Permissible Exposure (MPE) limits are not exceeded in areas where people are present. This is important for safety and compliance with FCC regulations.

1. **Correct Answer: C - Make sure that MPE limits are not exceeded in occupied areas**
   - **Explanation**: MPE limits are set to protect people from excessive radio frequency (RF) exposure, which can be harmful. When an antenna is installed indoors, there is a higher risk of people being exposed to RF fields. Ensuring that these limits are not exceeded helps prevent potential health risks.

2. **Why the other choices are incorrect:**
   - **A: Locate the antenna close to your operating position to minimize feed-line radiation**
     - **Explanation**: While minimizing feed-line radiation is generally good practice, it does not address the primary concern of RF exposure to people. The proximity of the antenna to the operating position does not inherently ensure safety regarding MPE limits.
   
   - **B: Position the antenna along the edge of a wall to reduce parasitic radiation**
     - **Explanation**: Positioning the antenna along a wall might help with certain types of interference or parasitic radiation, but it does not directly relate to controlling human exposure to RF fields. MPE compliance is not guaranteed by this action.
   
   - **D: Make sure the antenna is properly shielded**
     - **Explanation**: Shielding an antenna is not practical, as it would prevent the antenna from radiating effectively. The goal is to manage exposure levels, not to shield the antenna itself.

3. **Useful Formulas or Rules of Thumb:**
   - The MPE limits are defined in terms of power density, which can be calculated using:
     $$ S = \frac{P_T \times G}{4\pi r^2} $$
     where:
     - $S$ = power density (W/m²)
     - $P_T$ = transmitter power (W)
     - $G$ = antenna gain (linear)
     - $r$ = distance from the antenna (m)

   - Ensure that the calculated power density $S$ does not exceed the MPE limits specified by the FCC for the frequency in use. These limits vary depending on the frequency and the environment (occupational or general public exposure).