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But will someone tell me why you use 300om wire and not just a single strand??

Because to transfer the maximum energy (signal) from the antenna to the feedline and to the receiver there has to be a correct match. Remember don't try to reason it out and use logic, without enough of the theory behind it all that won't work. Just think it as "black magic!"

If your receiver doesn't have a 75 ohm connector on the back of it you should also use a balun (small tubular unit) with 300 ohm pigtail usually on one end to connect to the two screws on the back of the receiver and with a matching screw connector on the other end to go to coax.