So we don't really KNOW whether the Polaroid has a stereo or mono tuner!
It would be hard to believe they installed a mono tuner for a broadcast TV device since the U.S./FCC has mandated 4-channel broadcast audio since 1984. Here's the Wikipedia entry on the original mono audio plus the 1984-mandated three additional channels for all programs broadcast in the US:
Multichannel Television Sound (MTS), mandated in 1984.
Obviously, if a program was not recorded in stereo, it is received by both "stereo" channels as the same sound, rather than the "stereo difference" and, of course, it sounds like and IS mono, except on two channels if the receiver has that capability.
Most of the "mono-TV tuners" mentioned today seem to be more for computer TV cards and the like.
We really need more than the "sounds like" approach to let people know what kind of tuner the Polaroid really has!
"Maybe," one way, if your TV does this, would be to watch a program thru the Polaroid tuner that you KNOW has been recorded in stereo and see if the TV (or Polaroid?) "Display" shows Stereo or Mono sound. My TV shows this automatically so it is able to distinguish whether the sound is 2-channel mono or true Stereo (the "difference" channel plus the original mono channel)...might be Setup option others have to set to display such info. or a one time button push on the remote? Maybe a Polaroid user's TV also has a button or option for displaying program info like this???
A pretty reliable way to tell if you are getting stereo through a tuner is if you play your audio through an A/V receiver with DPL, DPL II, DPL IIx, or whatever and, with a broadcast that has Dolby Pro-encoded audio (I'm pretty sure CBS' "Cold Case," among many other shows, is in Dolby Pro, also "24" on Fox), you can see if you get the distinct surround audio through your rear speakers.
If you get no signal through the rear speakers, or it's not distinct from the front L/R audio, then you are probably feeding mono audio into your receiver. But if you do get the distinct audio, then you have to be getting a Dolby Pro signal.