Radio 1 - This radio is found directly to the right of the stairs leading up to the Widow's Wine lander . You will be able to interact with it.
Radio 2 - This is found in the area with the lander near stamin-up. On the other side of the big gas truck on the left side of the zombie window, If you crouch the radio with be through the wire on the ground.
Radio 3 - In spawn. Bottom floor. To the left of one of the zombie windows with will a big stack of stuff and if you walk up to the barrels and interact then the radio should start playing.
Radio 4 - Go into the pack-a-punch room. On the right side of it go up to the railing next to the zombie window and crouch and interact and the radio should start playing.
Radio 5 - This radio is found on top of the electrical boxes right next to speed cola.
Radio 6 - Go over to stamin-up. Now go to the big opening to the right of the mystery box spawn. Now look behind the small wall with a cinder block and interact and a radio should start playing.
Dr. Monty Radio - This radio is found on the ground next to a big canister in the lower floor of the spawn area next to the zombie window.