Converting circuit to wirelss

Hello!
I have a circuit with 6 leds which turns on by comparators and would like to convert it to wireless. Receiver with 6 leds turns on in sequence 1: LED1, 2: LED1 & LED2, 3: LED1 & LED2 & LED3, etc. and transmitter with my circuit. I was thinking to use RF but the cheapest IC chip transmitter and receiver cost $25. My question is what is the cheapest and best way to make it wireless? The distance between transmitter and receiver should be 5 ft.

Thanks,

Almazick

at 5 ft you can even use modulated IR beam. to use this you need a microcontroller (pic maybe) to get it send differend codes. and also one to recieve this.