James wrote:
"I have a goal of using it (1-watt FM transmitter) to cover my house so
I can tune the same music throughout."

Use twinleaad between the transmitter at one end of the house and a load
resistor at the other end. Twinlead will leak enough due to imbalance to
be received all along its length.

Works for 2-way radio operation in tunnels, etc.

Best regards, Richard Harrison, KB5WZI