Super easy to install, the radiating elements are made from 1.6mm diameter stainless steel wire

Specs:  250W PEP, 12M in length, termination is SO239 -

True Multiband design - Bandwidth @ 40M -100Khz, 20M-300Khz, 10M-400Khz approx

Generally, you will be able to get away without an inline coupler, but as with all end fed dipole designs, there may be a few bumps in the VSWR response on some bands. 

Bottom line is, that if you are super fussy about a Uber flat VSWR, then we recommend an inline coupler.