<form action="">
<input type="radio" onclick="location.href='[URL unfurl="true"]http://example.com/'">[/URL]
<input type="radio" onclick="location.href='[URL unfurl="true"]http://example.net/'">[/URL]
<input type="radio" onclick="location.href='[URL unfurl="true"]http://example.org/'">[/URL]
</form>