Hello and welcome!
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I get up on the roof and adjust the antenna angle and regain signal strength and again can loose the strength the next day.
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Is your antenna moving on its own from one day to the next? Do the mounts need to be tightened or do you need to add a set-screw to prevent things from twisting in the wind?
Your signal strengths are pretty good and the top six channels in your area are grouped closely together, so if your antenna is pointed at a compass heading of about 63 degrees, your antenna should be able to pick up the stations just fine.
If all you need is the top six channels in the list, then an antenna like the Winegard HD7695P or Antennacraft HBU33 is about the right size to handle this. No pre-amp would be needed.
If you want to split the signal to multiple TVs or have pretty long cable runs, then you might want to go up one step in antenna size to make up for the extra losses (e.g., the Winegard HD7696P or the Antennacraft HBU44).
There are also a bunch of translator/booster stations at compass heading 316 degrees. Do you know if any of them are important to you? Since these transmitters are in a different direction and are weaker, going after them means getting an even larger antenna and adding an antenna rotor (or have two antennas plus an A-B switch).
If your current antenna is already about the same size as the antennas mentioned above, then you probably already have enough antenna for the job and just need to figure out why your reception is not stable. Approximately how big is your antenna now?
If you antenna is already big enough, here are a few things to check to see if something is causing the signal to be unreliable:
- The pre-amp might be hurting things more than helping. Try completely removing the pre-amp from the setup to see if things get any better/worse.
- Make sure all the outdoor connections are protected from the elements. If any water/ice is getting into the connectors or coax, it will block a lot of signal.
- What kind of cable are you using? RG6 is usually recommended. If you have RG59, it will cause more signal loss over distance, and it is not shielded as well, so it may be more susceptible to local interference (e.g., microwave ovens, power tools, electrical noise, etc.).
There may be other reasons why the signals are varying over time, but I'll wait to hear back from you to better understand what your current setup looks like (antenna size, length of cables, type of cables, number of signal splits, etc.).