RFM12B antenna- without using a wire

Hi there,

I will be using several of these devices to communicate with each other.

Can anyone recommend a pcb antenna that I could use? I don't want to use wires in order to keep my setup small. The maximum distance I want to transmit is 3 meters. I'll get a pcb made up, hence the reason I can use a pcb type or anything else that can work.

Appreciate any help!