The article on 4U1UN is in the Oct. 2010 issue of CQ not QST. It's a very nice article with lots of pictures. Below is an excerpt taken from the article regarding guest ops.
"As of now, 4U1UN is off the air indefinitely during renovation of the United Nations Secretariat Building. Once the station returns to the air, Mohamed KA2RTD offers the following guidelines for ham visitors to New York who would like the opportunity be a guest operator:
People interested should send an e-mail to 4U1UN@un.org
. It is auto-forwarded to all club members, to see who, if anyone, is available. If professional duties interfere, we will have to decline; or if a potential guest is staying in New York City for a while, we will try to arrange something. Don't just show up in the lobby!... We try to help guests by being available when they come. We try to balance guests according to geographical area or country; someone coming from 10,000 miles away will have priority over someone from New York.
Sometimes we receive requests for skeds. Because of professional constraints, we cannot make skeds. We try to be fair to all. We can't play favorites on the air. We must take all comers.
So drop an e-mail to Mohamed or James K2QI if you're planning a visit to New York once the station is back on the air. However, be flexible with your time and don't be upset if their professional responsibilities prevent them from hosting you as a guest op."