About the amplifier:
Previously I had the AS-1090, but I have switched to the Kuhne. The results: A few more miles range and a better "edge" reception.
Attention: The AS-1090 has a Signal-Bypass-Relay, but the Kuhn hasn't one. This means: If the Power-Supply for the Amplifier is gone, you will still have a (weaker) Signal with the AS-1090. With the Kuhne the Signal will be totally gone.