Did naval wireless use directional antennas?

Did First World War naval wireless sets use directional antennas?

Not in the modern sense. They broadcast broadly, which could expose a force, but the battlecruisers' position was already known once they were fighting.

The sets did not use modern directional antennas; they were essentially broadcast systems. That made transmission security important because emissions could reveal a force's presence or general location. The caveat applied chiefly to a force whose position was still hidden, not Beatty once the Germans were already engaging him. His ships therefore had more to gain by reporting than by remaining radio silent.