I'm absolutely happy with my fixit antenna I received for my Galaxy S3. What I'm unhappy about is the results. I watched my bars dropping over a year until I had total dead spots where I used to have 2-3 bars. I went looking for an antenna because I found when I stuck the right length wire in the little antenna port, I got my bars back.
I ordered and followed a youtube talked me through changing it out. The replacement went off without a hitch, but did not help me get my bar count back up.
I'd say it was still worth the under $8.00 I spent to at least try. It left me unafraid to tear into my phone going forward. Best advice I've got for you is after you've tried, then go buy a new phone (unless someone has some advice for me to save it :-)THanks Guys !