*Question G1B06:
[97.15(b), PRB-1, 101 FCC 2d 952 (1985)] Under what conditions are state and local governments permitted to regulate amateur radio antenna structures?*  

*Correct Answer is  D: Amateur Service communications must be reasonably accommodated, and regulations must constitute the minimum practical to accommodate a legitimate purpose of the state or local entity*  

### AI Response: (may contain errors)  

Under the FCC's PRB-1 ruling, state and local governments are allowed to regulate amateur radio antenna structures, but there are specific conditions they must follow. Let's break down the correct answer and why the other choices are incorrect:

1. **Correct Answer: D**  
   - **Explanation**: The FCC's PRB-1 ruling requires that state and local regulations must reasonably accommodate amateur radio communications. This means that any regulations imposed should not unnecessarily hinder the ability of amateur radio operators to communicate. Additionally, these regulations must be the minimum necessary to achieve a legitimate purpose, such as safety or aesthetic concerns. This ensures a balance between local authority and the rights of amateur radio operators.

2. **Why the Other Choices are Incorrect**:
   - **Choice A**: "Under no circumstances, FCC rules take priority"  
     - **Explanation**: This is incorrect because while the FCC does have overarching authority, it allows for state and local governments to impose regulations as long as they meet the criteria of reasonable accommodation and minimum practicability.
   
   - **Choice B**: "At any time and to any extent necessary to accomplish a legitimate purpose of the state or local entity, provided that proper filings are made with the FCC"  
     - **Explanation**: This is incorrect because it suggests that local governments have unrestricted power to regulate, which is not true. They must still accommodate amateur radio operations reasonably and only impose the minimum necessary regulations.
   
   - **Choice C**: "Only when such structures exceed 50 feet in height and are clearly visible 1,000 feet from the structure"  
     - **Explanation**: This is incorrect because the PRB-1 ruling does not specify height or visibility as criteria for regulation. The focus is on reasonable accommodation and minimum necessary regulation, regardless of the specific dimensions of the antenna structure.

In summary, the correct answer reflects the balance that PRB-1 seeks to achieve between local regulatory authority and the rights of amateur radio operators. Understanding this balance is crucial for both compliance and advocacy in amateur radio operations.