Looking for a better lawn sprinkler
 

We have a currently have a cheap, oscillating bar, lawn sprinkler which is becoming unusable. Unfortunately, it is poorly designed with a slipping range adjustment and the oscillating mechanism tends to bind. I need to cover an area of approx 60" by 30".

I'm looking for a better designed and constructed sprinkler. Any suggestions based on personal experience (more than one year, if possible) is welcome.

Thanks,
Tim