What Use Is An F-call?

What use is an F-call? During the week I had the opportunity to work a rare DX-station using the antenna farm of one of the clubs I'm a member of. The 10m, 6 element beam at a height of about 10m or so worked great with my radio and the contact was made within a couple of minutes. I then got the idea to try a different antenna, a friend has a 10m, 5 element beam in storage in his shed. We went to a local lake, put the beam together and strapped it to a 3m mast and guyed the contraption with some rope. Using the Arm-Strong rotator, we managed to pick up the same DX station and made another contact. Both contacts were done with 5 Watts SSB, using my 857d and a battery. The second set-up was on a grassed area, the car was parked under a Morton Bay Fig tree, nice and shady, with little local interference, except that all of a sudden, around 3:30pm, we found ourselves surrounded by mothers and children. Turns out that there was a local school, not 200m from our location. Wide-eyed children plucked up the cou