You know what Marilyn? I was thinking.....again....... You could just do a small coil of copper --- say a very large "bangle" size & just throw that in the center of the birdbath. I think that would be plenty of copper to do the job.
I am a strong believer in the simple fact is that what matters in this life is how we treat others. I think that's what living is all about. Not what I've done in my life but how I've treated others. ~~ Sharon Brown