The Select-A-Tenna was very popular years ago. I think they made several versions.I use a Select-A-Tenna.
For the weaker stations, and for much more fun, I pull out my 20" PK loop. It was a bit pricey ( about $240 which included shipping ), but wow, it works great.
One of these days, I might break down and get a Wellbrook 1530 or another PK loop that covers the 3-18MHz , as i graduate up the dial into shortwave territory