Wonderful story, thank you for putting it on the web! Just hope it has a happy end.
Sadly I think you will have a hard time getting anything from the Office of Emergency Preparedness, which is the agency that is responsible for the speakers afaik.
These agencies are not in the forefront of conservation and rationalize everything they do as being required by 'national security'. The hawk nest was probably considered unsightly and therefore removed, on the pretext that it could interfere with emergency warnings.
Red Tailed Hawks do come under the federal protection, even if some of them don't migrate, but getting one agency to defer to another is much more difficult than getting an agency to bring a private entity into compliance.