Hearing in meetings

The Minimike is only partially useful. It is supposed to be directional but I find it only works well if it is pinned to the speaker (like my wife!). I have been known to pass it round the table to whoever is speaking but this tends to kill conversation.
I have read that you lie to mike flat and it picks up whoever is speaking but the background noise from other tables is still high.
Any clues on the better use of the Minimike?