vintage large rf tuning coil, came from a local radio station

made by E. F. Johnson part number 61313NT22

the piece stands approx. 27 inches tall and the coil itself is approx. 14 inches in diameter, the second photo shows a 20 ounce soda so you can see how large it is, thank you for looking 

I believe these coils were made out of silverplated copper, but I am not certain on that.