Perhaps it is that 28 MHz is a short enough wavelength not to need it?? Just thinking about CB, they dont need it.
Thinking aloud
A physically short aerial at resonance has a lower impedance so % shorter= lower impedance.
My understanding is that a shunt match is to get the impedance back up towards 50 Ohm.

I will leave it to more articulate people to explain better.

Cheers Tony

The most reliable for 10 metres is not the beacons or repeaters, its 27.555 MHz USB. I suppose its the one advantage of having the "Jolly Roger" crew in one band

Posted by: AA4PB
Insert Quote
Quote from: G8YMW on Today at 03:29:04 AM
If you already have 6 metres, you could put 2 metres up it, it'll load...

That depends on the type of antenna so you can't make a blanket statement. If its a simple 6M dipole directly connected to the coax it'll probably load. If its something like a 6M Ringo Ranger with a matching device in the base you'll likely run into trouble trying to use it on 2M.


The Ringo Ranger is VERTICAL, I said HORIZONTAL.
Yes a 6 metre dipole will load as will a 5 ele Tonna I know, I've done it.
The dipole has worked very similar distances on both bands ( circa 200 km flat band)

Brief .
Aerial up high, horizontal polarity. RG213 or better coax. Dont know what you have at your end.
If you already have 6 metres, you could put 2 metres up it, it'll load (3rd harmonic near enough) and give you a taster.
Remember, on 2 polarity is crucial (20dB ish loss for being cross polarized)

Cheers de Tony

Hooo rayyyyy. I hope the wind-ups and trolling will now end

It will probably appear on a reality cop show (Police Camera Action over here) I would heve laughed if when she put her "Chelsea Tractor" in 4WD she just dug herself in deeper.
Self inflicted, no sympathy

Wimo, in Germany make Big Wheels for 70cms, 2 metres and 6 metres. The 6 metre one is ~10 ft diameter

The only thing I can think of is similar to a 4 metre whip I got for my Wouxon, shame about it is the company that makes them do not do a version for 6 metres (DOH!!)
I dont know if anyone could roll one themselves?
The 4 metre one is approx 20 inches long with a loading coil about 8 inches up. Works a treat. Now the only problem I can see is would it have enough bandwidth?

K1CJS, you are spot on comparing the UK and US laws ("Due Care and Attention" and "Distracted Driving"), to all intents and purposes they are the same.
One point about 2-way radio, if there is something needing attention just throw the mike down, your contact will not mind.
Although using handheld phones are explicitly banned from use while driving, the number I see every day with the phone WELDED to their ears.
On roundabouts, at junctions, in towns, out in the sticks.
My favourite(?) is the one driving, on the phone and gesticulating with the other hand.

The only problem is police numbers have reduced year upon year (Council budgets!!)

Cheers
Tony

If this is true, then who is going to nick Plod when he picks up the mike?
This side of the pond, the use of hand held mobile phones while driving is banned (Doesnt stop anybody)
2 way radios are exempt (Thank you RSGB) but you can still get done  for "Driving without due care and attention" and the onus of proof is on you to demonstrate your innnocence.

Oh and I forgot, 70 MHz. Be very useful this side of The Pond with more countries getting 4 metres.

Nowt wrong with Wouxuns, my 4 metre one is excellent (Apart from the S meter, but show me a HT with an honest S meter)

OTT = Over the top
The DX27 is a helical 5/8 fibreglass whip about 5 1/2 ft long for CB which in my case has the 3/8 UNF screw thread mount (Pretty well standard for HF)

No probs at all, Kevin. I have a DX27 and a 6/2/70 whip on my car's roof  and have not noticed any problems with radiation pattern. Your CB whip is only 9" longer than the dual band aerial  thats neither here nor there.
As for alternative CB aerials I suggest borrowing various whips and "suck it and see". The DX27, or Sirio Hi power 4000 are as good as it gets for mobile, the full length 1/4 wave and big Firestick are probably a bit OTT for on the move (OK for static mobile)

Cheers Tony

My own thoughts are put 2/70 antenna on the roof. VHF (and even more so 70 cms) need to be as high as you can get and will not be too long (1 metre for a 1/2 wave on 2 and 2*5/8 on 70). I think I'd put the CB on the passenger side front wing. I dont know which CB whip you will be using but if its a full length 1/4 wave or 7ft Firestick then you will have to consider what you're going to hit