# Colo Void Clause Coalition; Antenna Systems Co-Location; Voluntary Best Practices
> **Rule** · Statement of policy and disposition of comments. · Published 2004-04-27 · Effective 2004-04-27 · 69 FR 22732
## Document
- **Document number:** 04-9513
- **Category:** other
- **Type:** Rule
- **Action:** Statement of policy and disposition of comments.
- **Citation:** 69 FR 22732
- **Publication date:** 2004-04-27
- **Effective date:** 2004-04-27
- **FAA docket:** Docket No. FAA-2004-16982
## Abstract

The FAA is revising its policy about the co-location of antenna systems on structures previously studied by the FAA. Under certain circumstances, the FAA will not require a person to file notice for an aeronautical study to add frequencies to an existing structure that has a current and valid No Hazard Determination on file with the FAA. On December 23, 2003, the Colo Void Clause Coalition (CVCC) wrote to Marion C. Blakey, FAA Administrator, and forwarded a Voluntary Best Practices Agreement Regarding the Potential for Electromagnetic Interference Upon FAA Facilities. The FAA finds that it can amend its policy to accommodate certain issues raised by the CVCC's Best Practices Agreement.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/04/27/04-9513/colo-void-clause-coalition-antenna-systems-co-location-voluntary-best-practices)
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