If you have an indoor radio that can receive the stations,
or if you can stream the stations to your computer,
and if your garden is within about 100 feet of your radio/computer,
you can get plug in a small fm transmitter,
then listen to it on a walkman.
http://www.xm411.com/phpbb/viewtopic.php?p=8151http://www.outlawradio.us/CCrane_Mod.htmlhttp://www.amazon.com/Crane-FMT-Digital-Transmitter-Adapter/dp/B0000E6I1NI used to do that, but now I have a droid with unlimited data plan,
so I just stream the stations to it. You can use earbuds or stereo bluetooth.