Double check your tones. I was on the mobile out of town a few weeks ago, and tried hitting the local repeater there. Somehow, I managed to mix up the split tones for the repeater and couldn't hit it. It wasn't until I got home and double checked the Radioddity software that I realized I had the right tones saved, but they were backwards. Also, just to rule it out, I would try putting the antenna directly on the radio rather than having the adapter(s).