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Hard to say Leon....
I'm not an antenna specialist but i know a thing or two about radio signals, so i'll do my best to explain.
The signal strength starts at the transmitter (tv station) and gets weaker the further you are from that.
Your antenna is also a variable (they come in different 'gain' figures - the higher the gain, the stronger the signal they will send down the cable)
All the cables in the chain from the antenna to the TV will lose some signal.
Some are designed to lose less than others....typically the thicker and stiffer they are, the less resistance they have, and therefore will attenuate less.....(and are usually more expensive as a result)
Some TV's pick up signals better than others as well...
the length of the cable from the antenna to the TV is only one variable....
I know this does not answer the question, but unless "I" could measure the signal strength at the TV end, its hard to say.
Your TV might have the ability to show rudimentary signal strength....it would be buried in the settings somewhere....you could measure what you have now, and make some assumptions about what a differing length of cable might do....
Having said that - 20m is a long way from the antenna - you must live in a palace!
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