Ham Radio Vertical Multiband Antenna 6-20m +40m

This is a vertical antenna using a 5.6m whip and some optional extensions and coil to tune from 6-40m bands.

The antenna does full quarter-length for the bands between 6 and 20m (4m as well) and for the 40m band I used some extenders to add another 1.2m to it and a coil between the extenders and the whip.

There's a screw to keep the M10 nut in place and I've designed two different sizes, one that fits the whip, another larger for the extenders.

Necessary parts are:

For the 6 to 20m antenna

• A whip 5.6M M10 Screw will give you the 6-20m bands (lot's of places to buy them from)

• (Optionally) A 7.6m whip, this will still give you 6-20m bands, but better efficiency on 40m, but potentially requires guy wires for the whip itself.

• A M10 Nut, I've used some nuts I found with a copper skin (makes it easier to solder)

• A 1mmx80mm copper disk, there's a template to drill the correct holes on the disk, this will be the ground. Big hole in the center for the plug, outside holes are for the radials, I'm using elevated radials.

• 3d print DrillTemplate (if using the 80mm copper disk)

• A round plug I've used N type, but for PL it's the same thing, the copper plate is the ground and the center is soldered to the M10 Nut

• M3 screws and bolts to put the thing together

• A tripod to put the antenna on it, I'm using a 2.8m tripod, but I'm upgrading to a 4.8m one and the radials will act as guyin ropes. For the taller whip I've also added guy wires to the whip.

• Wire for the radials, I'm using 4 elevated radials, the radials are cut for each band and disconnect depending on what band you're operating on, the radials are then tied to synthetic rope and secured on the ground.

• Synthetic rope 

• 3d print VerticalTripodInterface

• 3d print VerticalTop

• 3d print VerticalTopLid (this screws into vertical top, and locks down the M10 Nut and provides support to the whip

For the 40m antenna

• extra size on the radials(double from 20m or add coils on the radials as well)

• Extra segments to add to the antenna (with a bigger coil it will still work with 5.6m, but efficiency will be very bad)

• Coil for 40m, 1.2m + 5.6m (Coil is between the 1.2m and the whip)

• 3d print VerticalTopLidWide (the extra segments are thicker, so this allows a 19mm segment to fit where the whip would be), I've made a second one of these with a taller neck to give more support, this is to increase stability specially when using the 7.6m whip.

Coils I use these:

I'm also trying a different version of the antenna using a 7.6m whip one coil and 32-120cm extension, this allows me to play with efficiency or reduce the size of the radials, the idea is to have something that can be swapped out in the field. (Lot's of space, biggest size, small coil full size radials, small space, bigger coil smaller radials exchange a bit of vertical space for smaller radials), but I'm still testing this configuration.

Optional but better to have:

• Choke I'm using this one: