My remote works at least 50' as that's how big our fencing club is.
Tx & Rx use 17cm of 30 guage wirewrap for antenna.
Arduino Micro:
Input Voltage (recommended) 7-12V
Input Voltage (limits) 6-20V
So yes, it has a voltage regulator.
Microcontroller ATmega32u4
So more like a Leonardo than an Uno.