There is a large group of Ridgeline enthusiasts and owners, the Ridgeline Owners' Club. Some of us are hams. The URL is: http://www.ridgelineownersclub.com/
From the Home page, locate the tab "THE BOARDS"; scroll down until you find "MOBILE ELECTRONICS." From there, drill down to "Any RL - Owning Hams doing HF or VHF/UHF from their RL?", under my callsign (W7LV).
Expertise seems to be variable, as they say, and most of us are still figuring our how to drill holes in the firewall without piercing refrigerant lines, so it's a fertile field.
One lad is presently working up drawings to fabricate a Screwdriver mount for one of the cargo tie-downs.
Also, under "Mobile Electronics" are some detailed and extensively documented write-ups of major stereo installations in Ridgelines. Not my cup of tea, but when you see how one fellow, for instance, gets the headliner down to mount his XM Radio antenna, you can get a pretty good idea of where you can drill a hole for an NMO mount and the route for a coaxial cable feeder. Saves re-inventing the wheel...
I am presently running 17 and 6 meters occasionally with a Ham Stick on a 2" Receiver Mount on the trailer hitch, and working up another hitch mount for my 60's vintage Saturn 6 Halo.
Without running a spectrum analyzer or documenting extensive ops under all conditions, I can say that the Ridgeline is discernably quieter than my 2002 Dodge RAM pickup, driving the same places, under the same conditions.
Or, too noisy for Radio Astronomy, but a lot quieter than a 1961 Fairlane.
Not real scientific, but there it is.
The fact that the body is one piece, structurally, eliminates some challenges commom to Body on Frame pickups, antenna-wise.
Voice peaks do not cause any engine computer, cruise control or ABS problems on 17 or 6. Not tested on other bands yet
Be advised that the Power Outlets in the cabin are rated at 10 Amps, and the wiring thereto will likely not support more. Except for mid-power VHF/UHF you will need to go to the battery for your DC.
Come see our pictures for control head and rig mounting and also VHF/UHF antennas, and tell us what YOU are doing! We always allow for the possibility that the next guy might know more than we do...
73 DE BUCK W7LV