December 31, 2017




U. S. Securities and Exchange Commission
100 F Street, NE
Washington, D.C. 20549

Dear Sir/Madam:

	I hereby authorize Steven A. Thomas, Esquire,
Clinton R. Black, V, Esquire, Paul A. Snyder, Esquire
and/or Stephen Demos, Esquire to sign and file form 4's and
form 5's with the U.S. Securities and Exchange Commission on
my behalf. This authorization shall be in effect until
December 31, 2018.

				Very truly yours,

				/s/ J. Duncan Smith

				J. Duncan Smith