You do not need a splitter unless you have other services that need connecting. Do you have one that you don't need? Removing it is fine but it will increase the power levels to your services which can be a problem if they are already high. What services do you have currently?
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It only requires a splitter when you have a Hub3 and V6/TiVo box. That said there are two points to consider, 1) a splitter attenuated the signal by a small amount and may increase you signal level too much 2) if you have a splitter and no V6/TiVo the ‘spare’ socket on the splitter should have a terminator cap on it. If you remove the splitter you will need a female to female F connector.
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The only thing that might be an issue with a direct connection to outside is the absence of a safety isolator. If there is an inline isolator built into the hub cable this will be fine. If not there is significant risk of surge damage to equipment. Some older Diplexer/Isolators are confused with Splitters. These used to seperate the analogue FM radio from the TV (& now broadband) signals. These should not be removed.
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