The Armstrong Tower, also known as Alpine Tower, is a 129.5 meter (425 foot) tall lattice tower built and used by Edwin Armstrong in 1938 at Alpine, New Jersey, United States, at 40°57'39.0" N and 73°55'21.0" W (40.9607 -73.9225) for his transmission experiments that led to modern FM radio. The original transmissions occurred at 42.8 MHz. The tower is owned by Alpine Tower Company and is managed by CSC Management, LLC, both owned by Charles E.