I have the Sport Model and installed a Pioneer unit to replace the cheese-dog stock radio. My installer says no antenna kits available and no way to adapt to use the cars existing antenna. Tried the HONDA ANTENNA ADAPTER (TYPE I - AFTERMARKET RADIO) HD10 (UP TO 2009) #5560, which was suggested by one post but installer says it won't work. The installer added an amplified antenna but it just barely works. Desperate for a solution, any suggestions?