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The design changed in 2005, your truck has a metal bed.  The bed on the 2005 and newer (at least to 2007) trucks is of a composite fiberglass-like material.  The rear quarter panels are bolted to this composite bed. There are vertical steel supports at the rear of the bed where the tail gate connects. 


I'll post up a pic of my antenna setup here after while. 


Removing the sprayed-on primer from my antenna seems to have helped with Rx sensitivity issue.  fyi.


Edit: With this setup, the SWR was a little high, 2.1-ish prior to bonding the rear quarter panels to the frame, the cab to the frame, the hood to the frame.  Now 1.3 after bonding.


Question:  Is my poor recieve issue due to the antenna's close proximity to the cab, the plastic bed, all of the above?


thanks guys