Alright here's a long answer that covers possibly using your bathroom windows for your antenna location, and, if that fails, your roof.

As silly as it may look, those 12x48 inch windows in the bathroom may just be able to do the trick for you -- especially if they have a clear view to the south (if the sight-line from the window is not blocked by other buildings). It's worth experimenting with:

1. Bring one of your televisions into that bathroom (to narrow down the possibility of a bad long run of coaxial being the problem)
2. Put an antenna like the Winegard Flatwave FL-5000 or even your cheap Amazon antenna on the window.
3. Directly connect the coax from the antenna into your TV and run your TV's "scan channels" feature for 'antenna' or 'air'

If that process gets you all the channels you want, then you can hide the antenna with a little window curtain from Home Depot. Return the TV to its normal spot and consider using a preamp like the RCA preamp 1 to lock in the signal you receive before the long-run of coaxial to the main TV room. Buy some coaxial cable to run from the antenna in the bathroom window to your TV, and use some special coaxial staples to keep the wire hidden against the wall.

I have an LNA-200 and it is pretty good, I wouldn't call it noisy at all. In my old place (ground floor apartment, with a longish cable run, and another apartment and a parking lot in the way of the signal path) it was the difference between 2 stations and everything. Don't use it inside though.

Is there a difference between the RCA TVPRAMPR and RCATVPRAMPZ?

Not that I know of.

I ask because you don't include any reception details, are you certain a preamp will help in your situation?

Usually with a signal booster you want them to be low noise and be able not send over-driven signals. (Assuming you are in the US) A FM trap is good if you have real channels in the VFH range (Below channel 14). For UHF, a LTE filter is good to have if you are close to a cell tower.

Is your antenna outdoor or indoor? If outdoor, I recommend getting a pre-amp. If indoor, a line amp close to the antenna would be best.

Also the cable you use can make a difference. If you can, use quad-shield RG6 due to less line loss compare to RG-59.

Here a average preamp that works well for a lot of people but if you are trying to get a fringe signal I recommend a better amp and larger antenna.

I live in Northern San Diego and I get both LA and TJ channels. I have a 2 bay-tie for the UHF and half wave dipole VHF (both DIY built) for local channels. For LA I have a separate deep fringe yagi UHF and VHF antennas from MCM electrons with a channel master TITAN 2 preamp. (I'm going try out the Kizttech pre-amps to see if I get better and cleaner signal quality)