Y splitter will attenuate the signal, could end up with 2 snowy pictures (or none if digital).
Powered booster is the better bet. Maybe worth getting one with more than 2 outlets in case another TV is required? Only real problem is finding a 240V source of power as only power in the loft usually is the 6 amp lighting circuit. In theory if you find the live lighting circuit and connect it into a loft mounted 13 amp socket outlet then you can plug in the booster with the smallest fuse (1 amp) available in the plug. Not entirely sure how legal it is but I've had that arrangement for 20 years now with no problems....
Good luck!
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