You might have better luck on Craigslist.
20", to me, is too small for a TV - even though I grew up with "the big TV" being a 19 inch CRT.
These days I've got a 32 inch bedroom TV and it feels too small, but it's the biggest that will fit in that space. Eyesight declining with age is a big factor too though.
20 inch would be OK for a monitor, but probably not if it's pre-HD.
Is it a CRT? You might get interest from retro-gamers who want the original experience, no lag, lightgun compatible, etc.
If it's just an old non-HD LCD though, I'm not sure what you'd do with that.