Physics question about remote controls from car talk

[slickpoppa]

So I was driving around in Wyoming a couple of weeks ago and was reduced to listening to car talk on NPR, which is actually a pretty good show. Anyway, some guy calls in and says that he can increase the range of his keyless entry remote by touching it to his chin when pressing the button. I briefly experimented with this myself and it appears to be true. Can anyone explain why? The instinctual answer seems to be that you body somehow acts as an antenna, but that doesn't really make sense because you're body is already touching the remote anyway.