Recent viewer, 20+ yr ham, and first time commenter. I want to start by thanking you for your attention to detail in documenting your build. I am hoping to get a 4Runner once I hit the lottery. Wife wants it as much as I do which helps. This has been hugely educational for a me, the non- mechanic. I am my grandfathers grandson
So I am sorry to be critical of the build but that antenna and mount for this application is a huge issue. Consider it my bad upbringing (East Coast woods).
Drill the hole.
You are doing a phenomenal install that is rightfully commended and educational to us all avoid shortcuts on this piece.
Drill the hole.
The antenna requires a good ground. Clamp mounts and screwed in mounts (i.e 2 screwed on a bracket) do not offer that. Second, I've broken off antennas mounted on clamps. I've also had mag mount (see many on these forums) blow off on the highway with a small 2/440 antenna on it. Never mind when it hits a branch.
Consider NMO mount antennas. Weather/water/snow proof and sturdy. Never leak if done right with a quality mount like a Motorola or Larsen NMO. I use a Larson NMO 270 antenna with my truck 90% of the time wherever I go. Switch to another import with a low takeoff angle rarely if off away from good repeaters and I am familiar with their coverage.
You could drill into the hood or weld a bracket big enough for an NMO mount. Then run a base loaded antenna that flexes when hit.
Final thought. Look at where you might take this work of art and ask will that mount survive and save my life? You have a decent rig. It should survive abuse. Will the antenna and mount?
Look at
http://www.k0bg.com for a great reference on mobile installs. Great site and great info source. Has a VHF page of relevance.
Just my 2 cents. Off my soap box.
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