The signal strength will be reduced if shared between multiple TV's, so, you could use something like this. Connect your existing aerial to the 'input' socket and connect your existing TV to one of the output sockets and the new TV in the loft to the other output socket.
Other versions are available with more outputs so you could add more TV's later should you wish.
The splitter needs a mains power supply, and is usually best located in the loft near the aerial.
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