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Adding more voltage to transmitter and changing the antenna size? Answered

Hello! so I'm in a bit of a predicament right now, I have decided to do a project which checks the difference between antenna sizes and more voltage going through the transmitter to see if I am able to increase the range in a rc car. As of right now, I am thinking to use a 9v and a 12-volt battery but I am having trouble finding a RC car with these specifications. furthermore, I am looking for antenna sizes with 20cm and 10cm made of copper. I was wondering if you had any ideas on a cheap car just for like 5-6 uses that can also hold up to 9v and 12v with the antenna size being 20cm. Furthermore, I was wondering if i added more voltage to the transmitter, would that make the rc car range larger?