I have a somewhat eccentric friend who is holding onto his stupid dumb-ass Sony CRT TV's and waiting for them to die before he upgrades to a vastly superior HD picture. I gave him a spare HDTV. I bought him a FireTV Stick. He put them in the closet and waits! The problem with these Sony TV's is that they may last longer than he does.
Don't be somebody's eccentric friend. Upgrade those TVs as soon as possible. Then upgrade with HD Wally replacements. You won't regret it.
I am like Mr. BarnRat. I only watch PBS. That is the sole reason I have that antenna and OTA adapter: to record NOVA and Nature. I have hundreds of these shows stored on my EHD dating back to my earliest 722 days.