Well let me start by saying Thank You! I have had a problem with starlings and sparrows roosting on my radio antenna. I have just installed your wonderful Defender 4™ Pigeon Spikes and not one bird of any description as landed on my antenna. To be honest I was a little worried about what might happen when I installed them but there was not need to have been concerned at all. Please feel free to add this to your costumer comments on your web page. I have told some of my ham radio frends about your products so you might be having a few more orders. Thank you great service quick delivery and good communications great job.