I don't seem to fit your poll very well...

I'm not sure the intent of the "public land" question. Even if it's public land, the rules may be that only club members and guests with AMA cards can fly...

Anyway, three fields:

Two of them on public land, but for all practical purposes, only club members and guests can fly. Both have a frequency board, no pins. To reserve a channel, you stick your AMA or club membership card into the slot with your channel number on it. The only problem is occassionally people leave their cards. If that happens, you have to ask around, count the cars in the lot, etc., to make sure nobody's out looking for a plane in the woods, etc., before removing the card and putting it in the "left cards" slot. At one club, we have our pictures on our membership cards, which not only makes it easy to find folks on your channel, but helps you meet people as well!

The other field is on private land, only club members allowed. I don't belong to the club, but fly there as a guess occassionally. There is a clothes pin with a number on it for each frequency. You take the pin and clip it to your transmitter antenna. When you're done, you replace it. Huge problem with pins disappearing. What do you do if there's no pin, but nobody is flying on your channel? I guess you fly, hoping that nobody else (including the guy who took the pin home) wants to fly on your channel!

All three clubs have impounds, but they are not used religiously. Like most, I only use the impound if there's another flyer on the same channel as I am, which is very rare.