The mighty LOG PERIODIC antenna at ZID ARTCC

This is a Telex Hy-gain Model LP-1001CA.  These were installed in a number of government facilities over the years and some are still in use as of 2007.  The antenna is rated for 4 thru 30 MHz and I have used it with success down to 3.7 MHz with an SWR of less than 2:1

Here are some pictures and specifications.

The boom is 74 feet and the back element 94 feet

This is the rear loading coil assembly for element 19

A close up of the element 18 loading coil

Another view of a pair of loading coils

This is a ball tip of an element removed by lightning

Antenna coax/base entering the rotor box

This is a pivot point for lowering the antenna

Upper assembly and thrust bearing

That is one HUGE rotor in the box

Main coax - lightning protection and gas purge

More grounding

The coffee cup is for size refrence and coffee

Turning radius is 58 feet and wind load 3800 lbs

Wind surface is 95 sq feet and power limit 50,000 watt