I don't have the direct to wifi display but do use Access connected to my router and view the data online. With the Access I have had connection issues even though my Atlas is only 60 ft. away on the roof. I had the same trouble with my 5 in 1. From my experience if there are multiple roof and wall layers to go through anything over 50 ft. seems to give the connection trouble. My Access does better with sensors that are less than 10 feet off the ground and struggles with those on the roof and over 50 ft. away.
Keeping the Display or the Access 3 ft. away from other electronics like monitors, computers, TVs, routers, modems and the like does help. It may be tough to do if you are in a small room with many devices. Just get it as far away as you can.
Opening up my 5 in 1, I attached a 2 ft. wire from the end of the internal antenna and routed it down through one of the rain sensor drain openings and pointed it toward the Access. That helped a lot with missed data.
Instead of doing the same with the Atlas I decided to try putting a longer antenna on the Access receiver. I wasn't sure how to open it without breaking it so I contacted Acurite for that information. They informed me it was proprietary information and could not give out those instructions. What are they doing, running a top secret mission here? Anyway I tried to open it carefully with no luck. I dropped it by accident and it popped right open. I added a 2 ft. wire to the internal antenna and have it attached to the wall. I have had very few skipped data points from any of my sensors since then except when the Access decides to quick reporting for a while. Not sure why that happens but lucky that is pretty rare now.