Another setback for the Radio Station

I just purchased a new i.a.m Talking House transmitter and unfortunately it has turned out to be defective. A serious non stop humming noise is heard over the audio of the signal and it the problem is with the transmitter itself, not the audio chain. And it is not possible to connect it to a exterior outdoor antenna since the switch to accomplish that is broken. It will have to be shipped back for a refund and possibly a replacement sent with the hope that it will be fully functioning and in working order.