I ordered the Ramsey FM25b transmitter for the Christmas lights.  The FM25b transmitter doesn’t come assembled from Ramsey so I ordered it on ebay.  It was very nicely put together.  I couldn’t have done that well if I tried.  I ran a few tests and it works very well.  They say 200 feet with the amp at 75%.  I’m planning on putting it in the garage so I figure with no obstruction it should get over that 200 feet and if not I’ll turn it up.  You can also add a better antenna if you need even more distance.