https://purchasing.illinois.edu/commodity-codes/91316-construction-communication-equipment-including-antenna-towers/
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https://www.faa.gov/regulations_policies/orders_notices/index.cfm/go/document.information/documentID/9625
Order 6750.26 - Obstruction Marking of ILS Glide Slope Antenna Towers
The Federal Aviation Administration is an operating mode of the U.S. Department of Transportation.
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