A technique for improving radio coverage involves using interdependently tuned directional antennas. An example according to the technique is a substrate including two antennas, a transceiver, and a connector. Another example system according to the technique is a wireless access point (AP) including a processor, memory, a communication port, and a PCB comprising a plurality of directional antennas and a radio. An example method according to the technique involves determining a voltage standing wave ratio (VSWR) and interdependently tuning a first and second directional antenna to reach an expected radiation pattern.