2.4 GHz wired shared medium.

Hi! I'm working with Wireless Sensor Networs. I'm looking for a product that allows me to connect several motes at 2.4 GHz in a shared medium. (I cannot use the air due to interferences and reflexions) All the motes connected to the ports of the product have to be able to transmit to and receive from each other, in order to simulate the beacon mode. I don't care about the delay between them, just their bidirectional capability. The motes have an SMA antenna connector by the way.

Does anyone know something I could use for this purpose?

Thanks!