My favorite field antenna

My primary filed antenna is a monobander end-fed half-wave (EFHW) wire antenna erected on a carbon mast. It is cut to be resonant on the CW portion of the 20m band. I use it in a sloper or inverted V configuration (one leg usually longer than the other). With the tuner it works reasonably well on other bands like 30m and 15m.

Radiator

24 AWG ultra flexible silicone tinned copper wire from Amazon. The length is about 9.50 meters or 31 feet. It connects to the transformer with a 2 mm gold bullet connector.

Transformer

A miniature 64:1 transformer designed by DG1JAN. He has published several designs on GitHub. I went with the MicroUnUn variant. The classic 49:1 ratio works well too.

Coax

RG316 coaxial cable with BNC on one end and SMA on the other. The length is 10 feet.

Deployment 

I am using a 6m carbon or fiberglass masts. A small loop of rope is attached to a plastic eyelet near the top section of the mast. The radiator slides freely in the loop and allows me to adjust the length of the legs when deploying in an inverted V. The longer leg is connected to the transformer and the coax. I use a short rope to secure it to a nearby tree, brush or to my backpack :) The shorter leg is attached to a longer rope which is then secured to a tree or a brush in the opposite direction.  

Hardware

Winder, plastic eyelets and  lightweight cord from Sotabeams, a grip knot to attach the cord to the radiator, plastic S-clips.

Variants

I had a linked 15-17m version. It is shorter than the 20m version and easier to use in a sloper configuration when the space is limited. The tuner allows me to work on 20m as well. The extra hardware and the degraded performance on 20m and 40m makes it slightly less practical than the 20m version.

I also have a 40m version to use when the space is abundant. It is twice as big as the 20 version. The radiator resonates on the CW portion of 40m. Unfortunately,  it is slightly off resonance on 20, 15 and 10 meters. My solution is to either use the tuner or add a stub of about 30 cm on the far leg.