This is a sad day for me.... Haven't talked to Mr. Armstrong in over 20 years...
I remember David Armstrong form his days at KEYH 850 A.M. He built the station back in 1974, the first 'All News' radio station in Houston. I worked as transmitter operator at the station from 1978-1982. Back then, all critical-array stations needed to have a First Phone person on duty at all times the station was on the air.
He seemed to be a friendly and a very generous person. Mr Armstrong grew up in North East ,Texas one of the reasons he was such a nice person.
Artie in Columbus, Ohio...