I have an Air racer X WiFi controlled RC car. The range is okay. About 1000 feet. I was wondering since the car throws out its own WiFi signal and my phone picks it up and Icontrol it with an app if it would be easy enough to replace the antenna on the car to increase the range. Does anyone know about these cars?

1000 feet? That's pretty damn good, if you ask me. Especially on wifi. Sorry, can't help you though.