Corporal Henk Rimebreaker gives you 5 Listenomitrons to place at "strategic locations around Freeport. You will get a message telling you when you are in the right spot.
Place one on the second level of the guild registrar's building in East Freeport (-92, -32, -20).
Place one on the third level of the Freeport Militia House in West Freeport (158, 0, 123).