Delmarva Public Radio's transmitters are in two locations. WSCL, 89.5 is located in Seaford, Delaware. WSDL, 90.7 is located in Roxana, Delaware. As you can imagine, changing a transmitter is no small task.
Here is a "rough sketch" of the activity. The old transmitters need to be taken off-line and decommissioned. They also need to be removed to make room for the newer models. Once removed, both WSCL and WSDl will, for a short period of time, be on temporary transmitters until the new models are installed, wired, hooked up properly to the antenna on the towers, tested and re-tested and finally turned on.