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Leon,
I’m a retired commercial/ industrial electrical contractor
Shorter the better to reduce signal loss
Generally 10 to 15m from antenna to socket outlet is max but you can reduce losses and keep signal strength by using good quality RG6 coax cable with F type connectors
Ordinary duty 75ohm coax you buy from a local hardware store doesn’t cut it beyond 10m with digital signals today
Oh and make sure the wall socket outlet is good quality F type as well
An active signal booster ( powered ) with splitter would be a last resort if the above doesn’t work
May some bonafide TV installers can pitch in for advice as well ( TV installs were always a pain, especially in commercial / retail buildings where finding a good location for the dish and antenna was always an obstacle )
Hope the above helps
Cheers
Martin
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