This paper presents measurement and simulation results of a wireless communication network in Printed Circuit Board (PCB) context. First, we point out the needs and the constraints in term of communication for a Wireless Interconnect Network-on-Board (WiNoB) and we explain why we have chosen “Vivaldi” antennas for this application. Then, we present the transmission coefficients between the chosen printed antennas for the achievement of a 10 GHz demonstrator in a four antennas communication network. Simulation results show levels of transmission between -20 dB and -10 dB over a large bandwidth. To improve these levels, we propose a modification of the propagation channel by inserting a metal grid or a checkerboard between the antennas. The measurements confirm a significant increase in transmission levels, particularly in the case of “face to face” communication.