It wouldn't be transmitting anything during install. I don't know what the noises are (possibly a buggy sound driver), but I don't think it is caused by your WiFi hardware. That would have to be an exceptionally poorly engineered laptop.
As for disabling the WiFi, obviously that is not something that would be a standard option in the installer. If you really feel the need to turn it off, you could just shut it down with a command like:
ifconfig wlan0 down
Or if that is not enough, remove the modules that your WiFi hardware is using.