Review: GME Fold-Down Antenna Mounting Bracket, Model MB042

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When we designed our truck camper, we spent a lot of time making sure the tray fitted snugly behind the cab.

If the tray was no wider or taller than the cab, then whatever gap the cab fitted through, the tray would follow… low tree branches, obstacles on the side and so on.

This has worked extremely well.

External Cel-Fi antenna could be mounted on mirror or at top of tray.
The short Cel-Fi external antenna mounted to the tray’s headboard. It’s in a vulnerable position up there, just waiting to get wiped out by a tree branch.

The only thorn in our side has been the antenna for our Cel-Fi GO mobile signal booster. The Cel-Fi has an external antenna and an internal antenna. For the Cel-Fi to work properly, both antennas need to be isolated from each other, as we discuss in detail here.

And the only way we could achieve proper isolation on our setup was to have the Cel-Fi antenna mounted on the tray’s headboard.

So now we had an antenna sticking above the cab… in a perfect spot to be wiped out by low-hanging branches. We sort of overcame this by using a short 4/5dBi gain antenna. But its range is poor compared to the original, much longer 6/8dBi gain antenna.

The solution?

Use a fold-down antenna bracket. Then we could use the large antenna and fold it down out of the way when needed.

Selecting a Bracket

A quick Google search reveals quite a few fold-down brackets on the market. You can go for cheap and nasty or pay a bit more for quality. We’re strong believers in paying once for quality.

So after some research, we settled on the GME fold-down antenna mounting bracket at around $150. 

The GME Fold-Down Antenna Mounting Bracket.
The GME fold-down antenna mounting bracket. A quality piece of equipment.

It’s made from polished stainless steel, with all components built to withstand years of punishment. And unlike most of its rivals, the main M16 mounting bolt is solid… rather than having a hole drilled through the centre for the antenna cable.

Fitting the Antenna and Bracket

GME have provided a slot in the side of the bracket where the antenna cable can exit. The problem is, it’s on the wrong side.

The GME Fold-Down Antenna Mounting Bracket partially dis-assembled.
The bracket with the top half removed. See the semi-circular slot at the bottom of the bracket? That’s where the antenna cable is supposed to emerge from. So, down through the large slot in the black plate, then a sharp bend out the bottom. But the antenna folds towards us (out of the page), so the cable has to bend tightly over onto itself.

The slot is on the side where the antenna folds to. This means when it’s fully folded, the cable is bent in a tight 180° bend.

Not only this, for some reason GME fit a fancy internal cover plate (the black piece in the photo above). I’m guessing this plate is supposed to stop rubbish getting into the locking pin mechanism. Or maybe it’s to stop the antenna cable from getting caught in the locking mechanism.

But it means the antenna cable has even less space to bend and find its own comfortable bending radius.

Now I should say, our Cel-Fi antenna is a big beast with a full nut on the bottom, instead of the half nut used on larger UHF antennas. So the Cel-Fi antenna sticks down further into the bracket than a UHF antenna would. A standard UHF antenna would fit more easily, no doubt about that.

Our modified GME Fold-Down Antenna Mounting Bracket.
There’s no doubt, the Cel-Fi GO antenna is a chunky beast. The full nut and the longer post sticking down past the nut make mounting even more difficult. You’ll notice we had to die grind a chunk out of the bottom bracket so the nut wouldn’t foul on it.
Genuine GME antennas have a half nut and short post.
This is a standard GME antenna base. A half nut and no post protruding from under the nut. This would bolt straight into the GME fold-down bracket.

Still, I can’t imagine a UHF cable would take too kindly to being bent 180 degrees either.

GME make quality products and I’m sure they know their products much better than I do. But I still don’t see the logic in bending an antenna cable over on itself, especially when there’s another way to do it.

The solution in our case?

We removed the internal cover plate and chucked it in the bin. Then we drilled a 30mm hole in the opposite side to where GME have their antenna exit point. Fortunately, we had access to a milling machine and could make a neat hole through the polished stainless bracket.

The 30mm hole we drilled in our GME Fold-Down Antenna Mounting Bracket, to prevent the cable being bent over on itself.
We removed the black internal cover plate and drilled a 30mm hole on the side opposite to where the antenna folds.

So now when the antenna’s vertical, the cable runs smoothly down and out through the large hole in the side. And when the antenna’s down, the cable is virtually straight… no sharp 180 degree bends or kinks.

Problem solved!

It was however a bit surprising we had to do these modifications. I would have thought common-sense would tell you that no cable likes to be bent over on itself… especially antenna cable.

Would this problem have been avoided with a cheaper mounting bracket, where the exit hole goes down through the centre of the mounting bolt?

No. The cable would still have been bent tightly when the antenna was folded down. And at least the quality GME bracket can be pulled apart, modified and re-assembled without damaging it.

Using the Folding Antenna Bracket

So now we’ve modified the bracket to within an inch of its life, what’s the verdict?

We love it. It’s so simple to use, just a flick of the over-centre locking pin, rotate the antenna then flip the locking pin back in.

The antenna bracket is solid and sturdy… the antenna doesn’t wobble or vibrate at all. 

Our Cel-Fi Go antenna mounted on a folding bracket. Shown in the vertical position.
Antenna up…
Our Cel-Fi GO antenna folded safely away at the front of the headboard.
…antenna down. Easy!

Would We Buy Another One?

If I was installing another large Cel-Fi GO antenna, I’d buy another one… now we know what needs to be modified first.

If I was buying it for a UHF antenna, yes I believe it would do the job. Although I do have reservations about bending an antenna cable over on itself. I suppose GME wouldn’t have designed the fold-down bracket like they have if it wasn’t okay. Still…

What about the cheaper versions with the cable exit hole through the centre of the mounting bolt? I personally believe they don’t give the cable enough distance to bend safely… although I’m happy to be corrected if you’ve been using one for a while without any issues.

Considering the rough roads we travel on though, I’m more than happy to pay a bit more for quality.

Note: We bought the GME fold-down antenna mounting bracket at full retail price. We are not affiliated with GME in any way.

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