I want to improve my "Rover App-Controlled Spy Tank"

Hello everyone, I thank you for taking the time to read this.

I just bought a "Rover App-Controlled Spy Tank" from Brookstone. I like the tank, but there are a few things that I would like to improve one it.
  • For a spy tank the motors that drive the tank make way too much noise. 
Does anyone have any tips on how reduce the amount of noise the motors are making?
  • I would like to lower the height of the WiFi antenna, and boost the range the the antenna.
Does anyone have any tip on the best way to do this?
 
Here is one of the many reviews on Rover on the web. LINK

Thank you again for your time, and any help you might have for me.