so you will have about 50 cm between devices.

Assume 900MHz frequency. Quarterwave is 8 centimeters, so you COULD have a 3" vertical whip antenna on each, as part of some handle.

At 100,000 bit/second data transfer, you'll need -20dBm from each of the nodes, or about 0.0000010 watt.

Biggest issue is time-aligning the packets, to avoid interference.

so you will have about 50 cm between devices. [assuming 8meter by 8meter working area]

Assume 900MHz frequency. Quarterwave is 8 centimeters, so you COULD have a 3" vertical whip antenna on each, as part of some handle.

At 100,000 bit/second data transfer, you'll need -20dBm from each of the nodes, or about 0.0000010 watt.

Biggest issue is time-aligning the packets, to avoid interference.