*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)  

The correct answer to the question about state and local government regulation of amateur radio antenna structures 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.**

### Explanation of the Correct Answer:
- The FCC's PRB-1 ruling establishes that while state and local governments can regulate antenna structures, they must do so in a way that reasonably accommodates amateur radio communications.
- Regulations should be the minimum necessary to achieve a legitimate purpose, meaning that any restrictions should not be overly burdensome on amateur operators.

### Why the Other Choices are Incorrect:
- **A: Under no circumstances, FCC rules take priority**
  - This is incorrect because while FCC rules do take precedence, state and local governments can still impose regulations as long as they comply with the PRB-1 guidelines.
  
- **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**
  - This is incorrect because it suggests that local governments can regulate without regard to the impact on amateur radio communications. PRB-1 requires that regulations must accommodate amateur communications reasonably.
  
- **C: Only when such structures exceed 50 feet in height and are clearly visible 1,000 feet from the structure**
  - This is incorrect because there is no specific height or visibility threshold in PRB-1 that allows for regulation. The ruling focuses on reasonable accommodation rather than specific measurements.

### Summary:
- The key takeaway is that while local and state governments can regulate amateur radio antennas, they must ensure that such regulations do not unreasonably restrict amateur operations. The regulations should be the least restrictive necessary to achieve their legitimate goals.