Mast 1280122 — Arlington Heights, IL

At 20 m, structure 1280122 is about 41% of the 48 m average across the 965 structures registered in Cook County. It is about 29% of the Illinois average of 69 m across 7,110 registrations. Among the 3,482 registrations nationwide filed under the same structure-type code (MAST), the average overall height is 53 m, so this one is about 37% of that figure.

The site's filed ground elevation is 215 m, which puts the top of the structure 235 m above mean sea level.

The registration places the structure near Arlington Heights in Cook County, Illinois, at coordinates 42.04367, -87.98919, with the site address filed as "509 1/2 WEST ALGONQUIN ROAD". Cook County has 965 FCC-registered antenna structures, the largest count among the 102 Illinois counties with registrations, and 641 of them are marked constructed. Illinois as a whole has 7,110 registrations, the 6th-largest total among the 50 states and DC.

The tallest other registered structure within about 40 km is Chicago, IL · 1032959, a building tower at 527 m (constructed).

Constructed means the owner has notified the FCC that construction is complete, so the registry treats the structure as standing. The FCC issued registration 1280122 on Feb 19, 2026. Nationally, 141,895 of the 197,770 registrations (71.7%) carry the constructed status, including 5,177 in Illinois.

The FCC record lists American Towers LLC of Woburn, MA as the registered owner, under FCC Registration Number 0011498342. Across the registry it holds 21,809 structure registrations, the largest portfolio among the 7,865 owners with two or more, including 881 in Illinois. Its most common filed structure-type code is LTOWER (5,885 registrations).

The registration cites FAA aeronautical study 2002-AGL-3947-OE, the FAA review of the structure's effect on air navigation. Its marking and lighting code, 1, is listed on the FCC registration form as "None".