A little Sunday project regarding comms/antennas. So, a few things: First, as noted before I have a GMRS radio (just a low-power 5-watt set for local comms) and also have a CB (not currently installed, but will get around to it eventually) since some people in some areas use that (and we have CB in the Sequioa support rig, so having comms during rally travel will be nice). I also have a personal dislike of antennas in front of me when driving. Don't ask me why, I just don't. My old Porsche now has a roof radio antenna so i could get rid of the fender-mounted one....and the Raider's fender mounted antenna is going away.
So, with three antennas, I needed to figure out where to put them, ruling out anything forward of the windshield. Options are side-body mounts (not great for narrow trails with branches), roof mount magnetic (means a bunch of wires going through window/door seals), roof mount drill mount (means drilling holes in the roof and trying to get them under a 30-year-old headliner without ruining it). All of those seem E36 M3ty. So I decided to build an antenna platform on the tailgate above the spare tire. One of the keys was to keep the antennas far enough from each other to avoid incidental contact. Not too concerned with interference since I'm running all lowish-power stuff and the CB and GMRS would never be on at the same time anyhow. I'll be using no-ground plane (NGP) antenna for CB, but the CB antenna will be able to use the roof as a groundplane to some degree since it will stick up. But also wanted to keep them low enough to not get broken off and so they will still fit in my garage if needed.
Anyhow, let's get some steel out. Decided to use some C-channel and flat plate and just fab up a post and crossbar that mount to the spare tire mount. It's already spaced out from stock to accommodate the bigger tire, so the bar just replaces the spacers on one side.
These are just huge nuts used for locating spacers (not actually threading into them). Didn't even prep, so E36 M3ty tack welds on zinc bolts. Just needed them to stay in place lol.
Then a perpendicular T-bar. It's 24" long but offset to the driver's side so it sits evenly over the spare.
Attachment point
Post clearance with the spare is a couple mm...so perfect.
Had to make a small notch in case the rear wiper goes too far, to avoid contact.
So, there it is...I stopped the wiper at vertical just to check for clearance, in case you're wondering.
So, I'll get around to putting some antennas on it, at about 10" spacing, and see how it works in terms of signal, interference, etc. More on that once I get everything I need. Also need to figure out how I want to run the wires - they'll go down the back of the post, but not sure if I'm going to bring them through the door or go into the rear quater over the taillight. We'll see....
In other random stuff.....got a snatch block, which is probably overkill capacity-wise, but whatever.
Also picked up some 1/4" synthetic winch rope (rated to 7000# so should be fine) to replace the steel cable. First, because I dislike steel cable breaking E36 M3 if it ever snaps (rope won't cut anyone's arms off, lol...). And second it's probably a good 5lbs lighter, which is nice for something I will be moving around. Anyhow, we'll see how it is - just some random Amazon brand that a couple guys I know who are hardcore wheelers said is good. I'll probably throw the steel cable in the gear box as well, just in case the rope isn't up to whatever task.....TBD
Had to modify one end to attach it, since the winch attachment type is a pressure screw rather than a bold...but wasn't much of a hassle.