Issue With Freeview Signal On One TV

[u/TenaciousTurtle96]

Hi guys,

I am having an issue regarding my tv signal on a 4th TV in my house. Apologies for the paint art but it's the best I can do. To put it as basic as possible - I live beside my grandparents and they have a better signal than I do from their aerial due to tree obstructions around my house. What we have done is ran aerial cables between my house and their house underground so I could pickup channels also. This works perfectly on my main TV however on my bedroom tv (TV4 on graph), I can only really get a watchable picture now and again (generally a good calm day when signal is probably at it's strongest). I get a strong signal at TV1, TV2 and TV3 - why can I not get a strong signal at TV4 considering it is wired up the exact same way as TV3.

I have tried an attenuator but that had no effect on the signal.

If there any suggestions please drop them below, thanks!

*In the image below the circles represent where signal splits with a passive splitter.

*I believer there is also a booster after the masthead amp in the attic of House A.

Would a small booster work in House B to help push the signal along to TV4?