Final answer:
The provided information does not contain the explicit answer to the question regarding separation from nonradar airspace boundaries. Standard FAA separation procedures are referenced but are not directly applicable to the inquiry.
Step-by-step explanation:
The question seeks to determine the appropriate amount of spacing needed to separate radar-controlled aircraft from the boundary of airspace in which nonradar separation is being used when the antenna site is less than 40 miles away. The correct answer to this question is not explicitly provided in the reference information given. However, the standard separation procedures provided by the Federal Aviation Administration (FAA) include maintaining specific distances for safety and operational efficiency, but these standard procedures do not directly answer the posed question about separation from nonradar airspace boundaries.