I have been asked if this is legal. It is legal... enough. FAA Part 101 regulations stipulate what can and cannot go up unmanned and what you are required to do before during and after flight.
We decided to have a very small payload (less than 1/4 the smallest size mentioned in the FAA regulations) and just launch it guerrilla style.
If you are still unsure, homeboy here did the time to research this and write up his findings.