What Use Is An F-call?

What use is an F-call? Recently I went looking for a place to set-up my radio during lunch time. The location I've been looking for needs a couple of things. Most importantly, it needs to be reachable within my lunch break - being self-employed, that's a little more flexible for me than for some, but it shouldn't be a 30 minute drive there and another 30 minutes back. For me, the location needs to be near water, accessible by car; I should be able to park next to the water, so my antenna ground-plane can reach the water and it needs to be away from houses with plasma screens. In case you're wondering how my antenna system has been constructed, it's quite simple. I use a 12m squid-pole, think fishing rod on steroids, it's called a Spider-Beam. A local manufacturer made me a steel-plate with a pipe welded to it. I park a wheel of my car on the steel plate, put the squid-pole over the welded pipe and run a piece of wire to the top. At the bottom I have an SGC tuner, an SG-237, which plugs into the wire going