Believe it or not, an A.M. radio question

I am on the 33rd florr of a downtown office building and have a small Marantz office system with a built in AM/FM tuner. FM reception is fine even with the stock antenna. However, with the stock plastic loop for AM, I cannot pull in any stations. Have any of you in high rise buildings used any after market AM antennae that will pull in AM stations in this environment. I want to listen to some of the local talk shows.

I have no idea whether something like the Terk powered antennae will work on AM in this situation.

Thanks for your help.

Frank