How to boost TV signal reception?

I thinking of moving some furniture around in my living room. I have a 6 feet coaxial cable connected from this old signal amplifier 10db to my TV. From the amplifier, another 6 feet cable goes to the splitter (I have 2 TVs) and then 50 feet cable going to the big antenna in my attic. So it looks like this:

Antenna in my attic <---25 ft cable--> 2 way splitter 5 - 900 Mhz <---6 feet cable & 10 feet cable going to different TVs---> 10 db signal amplifier <--6 ft cable-> TV

It was setup that way 20 years ago and never had a problem. I bought this "Monster THXV100F50 THX Certified Coaxial Video Cable (50 feet)" for about $10 on Amazon and connect it from the splitter to the signal amplifier and now lost most of my digital channels (I lost 40 of the 45 digital channels). What can I do to fix it? I understand that the signal degrades when I split it and use long cables, but I need this much cable b/c I want to move the TV to the other side of the room. Good thing I tested this out before moving any furniture in my room.
 
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