Activating on the Road: Stealth Activating with the AX1 Antenna System

by Brian (K3ES)

The AX1 Antenna is on the air from the Profile View parking area at Mount Rushmore National Monument.

As I prepared my radio gear to do Parks on the Air (POTA) activations across the states of the American West (Six Weeks and 7300 Miles: Activating on the Road), I knew that I would need to operate in a wide variety of different park environments. This need was primarily connected with differences in topography, vegetation, population, and regulatory environments.

A selection of wire antennas, a throw line kit, and some collapsible mast options would serve many of my needs well. However, I also expected that our travel schedule might require me to activate quickly or unobtrusively, from less-optimal locations. Since I do not have an HF rig or antenna system installed in my truck, any vehicle-based operations would need to use equipment from my portable POTA kit.

For these occasions, I intended to use either a wire antenna supported by a telescoping mast attached to back of the truck, or my diminutive Elecraft AX1 base-loaded vertical antenna system. During the trip, I found that I could use the AX1 to complete rapid, and extremely stealthy, activations.

My AX1 kit is kept in a Maxpedition Fatty pouch.

AX1 components are organized inside the pouch, and counterpoise wires are located in a hidden zippered pocket.

I had ordered the AX1 antenna system from Elecraft early in 2024, and took delivery in March. I used it in a variety of configurations, gaining experience and confidence in its ability to make contacts (K3ES Travels: Ten Days of QRP with Compromised Antennas).

In early May, I also ordered an AM1-2 clamp-on antenna mount from ProAudio Engineering, and it had proved its versatility in deploying the AX1. All of this equipment and more found its way into a Maxpedition Fatty pouch, to become part of the stealth antenna kit packed for our trip across the country.

I Wonder if this Will Work…

A view from the truck… The AX1 antenna mounted on the fender, is seen with a great landscape from Badlands National Park.

Badlands National Park (US-0005) was one of the most spectacular parks that we visited on our cross-country adventure. I plan a future report with full coverage of the park and the activation, but the conditions in the park led me to make my first attempt at a truck-based activation. Shade was almost non-existent, the sky was cloudless, the air temperature was over 90°F, and the ground was too hot for POTA Dog Molly’s paws.

We pulled into a parking space at a roadside overlook, so that Becky could take some pictures, and I decided to try for a quick activation from the truck. After I set out a bowl of water in the back of the truck for Molly to drink, I pulled out my radio gear, and looked over my antenna options. I could have put up a mast and used a wire antenna, but I did not want to block access for other visitors, so my thoughts turned to the AX1 system.

The small size of the parking lot made it important to keep my operating footprint within the confines of my own parking space, both to avoid inconveniencing others, and to minimize the risk of damage to my antenna components. I decided to try attaching the AM1-2 clamp to the cylindrical base of my 2m/70cm mobile antenna, which is mounted on the front fender of the truck. The AM1-2 clamped on securely, and provided firm support for the the AX1 coil and whip. I also attached a counterpoise wire to the ground screw of the AM1-2, then tossed the wire under the truck to keep it on the ground, hidden, and out of the way.

That left two questions: could I get the antenna to tune, and would it radiate well enough to get contacts? I connected my feedline to the AX1, ran it in through the open driver’s window to the KX2, and quickly got answers to both questions: yes and yes. Continue reading →

Many thanks to Terry (N7TB) who sent the following question by email and has kindly agreed to allow me to share it here along with my response on QRPer:

Hi Thomas,

I cannot tell you how much I appreciate your POTA videos and all the suggestions you have made that I have adopted. I look forward to every activation you put on video. […]

[…]I have a question for you about using your AX1, and would really like your advice. I marvel at how quickly you can activate a park even with an AX1 antenna on 5 watts. I also have an AX1 antenna, counterpoise and KX2[…].

Anyway, I was out today activating K-0213, Maude Williamson State Park, about 20 minutes from my QTH in West Salem, OR. I operated 12W into a 33ft. EFHW antenna suspended vertically from a 31 ft. Jackite mast. All my activations are CW; I usually activate 20 meters.[…]

I was able to finally work 22 stations in an hour and a half, mostly in CA, UT, MT, and one in AZ. I did get a contact in KY, AZ NM, and MB, but it was a tough go for them to hear me. Most of my activations take me a bit over an hour to get 20 contacts.

As I thought about how much easier it seems that you are able to activate, I started to think about geography and population density differences between the East and West coasts. I used Google Earth and measured almost all points east of the Mississippi from Asheville and most were within 1200 miles. I would guess 2/3 of the US population live in this area. I drew the same range from my QTH and I get about half way into MT, barely into WY, most but not all UT, just touch the NW corner of AZ, and all of CA. In all but CA, I would guess the population total in this vast area is less than Illinois. That is my dilemma. I would love to be able to go out, setup my AX1 with my KX2 on even 10 watts, and make quick activations, but I would be surprised if I would get many contacts because the distances are so vast in the West and population density so low. I will actually try using the AX1 when the WX gets better and I can sit at a picnic table. So far, I have had little success with it, even deployed with the correct counterpoise. Do you have any thoughts on how to be successful with the AX1 from the West coast for POTA, or should I just concentrate on other antennas?

[…]Thanks again, Thomas, for the emails you have sent me with suggestions about equipment, and for all your great videos.

Very 73,

Terry

N7TB

Hi, Terry,

First of all, thank you so much for the kind words. I really appreciate that!

Regarding your message:

Keep in mind that the day you were operating was a very strange day in terms of propagation. There were times when we were having radio blackouts (especially in the western half of the US) and there were times propagation was amazing, yet very unstable. We were hit by so many heavy CMEs this weekend–one seemingly on top of another.

I think you do have a valid point, though, about the geography–one I try to mention when talking about compromised antennas like the AX1.

I realize that I enjoy a lot of success with the AX1 because of where I live. I guarantee that the bulk of the US ham radio population is within easy reach of my AX1 antenna, no matter what band.

For you? There are no hams to your west (within easy reach), extremely few to your north (save WA and BC), and the best ham density is to your south in California.

In your shoes, here’s how/when I’d try using the AX1 (keeping in mind I’ve never operated POTA in the western states):

First, I would focus on using 40 meters when the band is healthy and/or for early morning, late afternoon/evening sessions. That should snag contacts across WA, OR, and CA with the AX1. Might be a stretch for southern CA, but I think you could make that work. The only caveat is that flaring has been wiping out daytime 40 meters a lot lately. You might check band conditions in advance.

I would also consider spending time on 17 meters, and possibly 15 meters with your AX1. This might throw your signal across to the midwest, Ohio Valley, and beyond. 17 and 15 meters isn’t typically as productive as 20 meters (at least, for me) but I routinely log west coast stations on 17 meters with the AX1. 15 meters is also getting a lot of attention in the POTA spots!

A wire antenna is almost always a better option than the AX1 if you have the time and space to put it up, but the AX1 is just so darn convenient.

Cheers,
Thomas
K4SWL

More suggestions?

The reason I asked Terry for permission to post his question and my reply here on the blog is because I suspect there are west-coasters (and those in similar geographic situations) who may be able to share some helpful strategies.

There are so many factors involved beyond what I mentioned in my reply. In fact, I imagine if the goal is to work parts further east, then adjusting the activation schedule for Central and Eastern time zones might also help (for example, not activating during dinner hours when I always see a bit of a lull in hunter activity).

If you have some experience, please feel free to comment!