I think you mean when you register yourself.Believe FAA rules state "under 400 feet". You agree to that if you have even a hobbyist license. I am finding that I fly about 160 feet which gets me the sights I want to see on my flights.
As I recall, it does state that, as well as a few other things. However, the FAA has given out incorrect information and exceed their authority in the past. Well after the registration was in the place the FAA themselves confirmed in a letter that hobby flying was not limited to 400', per their own statues. It's been discussed many times and beat to death many times.... this is simply a _fact_. Anyone can say whatever they want... it's not going to change what the FAA have confirmed themselves in writing. People can "know" who they want, "talk" to the "FAA", work on what ever "projects" they want.... it's not going to change what the FAA themselves have confirmed in writing. It's just not.