All transmission lines (Thats what the 75 ohm coaxial is) need correctly terminating to stop loses this can be passive or active i.e. a simple Y connector which has resistors inside or a amplifier which has some form of power but you can't just connect together without heavy loses if it works then your aerial must be far too big in first place. Many options are available from few quid to Â£100 depending what you want it to do. Try looking on web loads of devices are available. I think there are links to screwfix on this site!
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