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ATSC 3.0 is being rolled out, some ATSC 1 channels are being removed to make way, and in a few years ATSC 1 will be switched off making your current box obsolete in a few years. But for now you don't NEED to worry about ATSC 3.0.
In a few years when ATSC 3.0 is all that's on the air odds are ATSC 3.0 tuners won't have analog outputs for CRT sets...They will probably only have HDMI connectors for the output. You'll probably need to get an HDMI to AV adapter to convert to an analog output. Most people don't use OTA TV and almost nobody not on this forum (or a retro videogamer) uses CRT TVs so you probably can't get it at any brick and mortar store...but you can buy such things online easily.
But again you don't NEED to worry about ATSC 3.0 yet.
Many of the roughly 12 year old boxes from the ATSC transition have menu options that allow you to fill the screen. Sometimes that setting will be called aspect ratio, screen type, or Zoom. My Zenith DTT900 DTV converter box has a menu option for making the output fill the screen.
I've never owned an RCA DTV converter so I don't know what the menu settings for your box are.
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