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Here's a teaser for you Eddie, A99 at 10' to feed, isolated mast and 24' of coax, this plot is nice and tidy, but contains something I wasn't expecting to see, see if you can spot it:

I thought you might chase me for an answer at some point ;) my original intention was to use a fibreglass mast, however my fiberglass mast is hollow and with the weight and lever effect of the A99 I decided against using that, so I used an alloy pole with a plastic sleeve to isolate the antenna...

I've not spoken to Steve on air or in person, but I have many times on one particular UK based amateur radio forum, a very helpful chap and will to share his knowledge and experience with anyone that cares to ask, I asked him how he tested the chokes, this was his reply:

Double post sorry

The thing about all these chokes is that they are all bench tested designs with an AIM4170C vna, they are guaranteed designs built on solid principles. The big caveat with any air core choke is that small variances in design and length can quite quickly have an adverse effect and make matters...

If it's just for CB use then 5 turns off RG58 or 213 on a 4.25" diameter form is the way to go, why 4.25"? That's simple, in the UK our household sewerage system has a pipe that is 4.25" diameter, any off cut can be bought for pennies, I bought a 4' length just to use as a former for chokes and...

The length and the width are as long and as wide as they need to be in order to match to 50 ohm, stretching the coil will alter the impedance by a small amount. My shunt coil is longer than it is wide, the reason? simple, the round tube I had to hand wasn't vary wide, it meant I had to add more...

Well, I have the A99, I have the fibreglass mast, and I have my VNA, but the weather is awful, blowing a gale and certainly not the kind of weather to be messing with 18' antennas plus mast, especially with an expensive piece of test equipment attached to the base of the antenna, testing will...

Hi Marconi, now here's the thing, an antenna will find a ground/counterpoise even if it has to make that up via stray capacitance to anything surrounding it. As I've said before my main interest in the hobby is amateur radio rather than CB radio, and in my line of work I get the opportunity to...

I wouldnt go as far as to say I understand it all, just trying to make sense of it all like everyone else ;) This site is a great place for discussion, some clever people on here sharing their ideas and experience. Edit: picking up an A99 on Thursday,;I'll carry out as many tests as I can think...

I've just asked locally if anyone has an A99 I can run some tests on, I intend attaching my VNA at the base of the antenna, the antenna won't be attached to any mast so there will only be the antenna and VNA in the circuit, I'll take some screen grabs and report back, however that'll be later...

Marconi, if I'm understanding you correctly, you believe the EFHW A99 doesn't necessarily require radials because of the low current at its base? How does that then fit with Kirchoff's current law, the base of the antenna may be a low current node, but what of the mid point of the radiating...

My take on the CB no radial EFHW is that they work because the feedline isn't choked, however if the choke were to installed in such an installation then the mast supporting the antenna would carry the common mode current, isolate the antenna from the mast, choke the feedline and then you'll...

There's no need for a choke on a Sirio Gainmaster because Sirio built one into the design. What is it about a Super Penetrator and a V4K that negates the need for a choke?

"No problem = No choke" How do you know if you have a problem or not? If you were planning a high performance antenna install, you'd consider a number of things to make sure you had maximum efficiency, firstly the antenna type, the height, the sighting, the coax, quality connectors etc, it's at...

I suppose one of the benefits of living in the UK is a stack of DXCC on the doorstep, 6m has been a blast over the last couple of days. I have an hour's drive to work in the early evening and have worked many stations whilst mobile, nothing I'd consider real DX, topping out around 1,100 miles...

One of the internet's more accurate sources for current choke information: G3TXQ common mode chokes

I have made no claims in this thread re antenna performance, be that 1/4 or 5/8WL, maybe your closed mind leads you to believe differently?

30 CBers could never be wrong eh? With a closed mind it's impossible to see what's in front if your face, your comment; "Pointless silly software" tells me all I need to know about the information you present here, rather than back up any of your claims with rigorous testing, you instead...

Mast isolation and feedline choke along with a good set of radials is the way to go ;)