Your client has contracted with you to set up a building-to-building wireless link to extend the client’s office-building LAN into its manufacturing facility on the opposite side of the company parking lot. Based on the client’s requirements, you have chosen to install 5GHz ISM radio repeaters with directional antennas for the wireless link. If the diameter of a radio antenna is equal to the wavelength of the signal it will be transmitting, what’s the diameter of the antenna you’ll be placing on each building?