Hi Guys
I uploaded the video on YouTube on this link, DropBox is not working. http://youtu.be/dNBekvzlxgM Hi guys The simple solution that is working very well since 2009 is the HWF. Why not two horizontal loaded loops end-fire. Two identical horizontal loops see the ground wave signal at the same way Va=Vb and because the 180 degree out of phase we have Va-Vb=0 . A loaded loop has a cardioid patter and two in phase , like the horizontal WF , have over 90 dB attenuation on vertical polarized signals at the front lobe and at same time has 11.5 to 1332 dB directivity for horizontal signals The main lobe is near 40 degree and + - 20 degree for 3db, it means deep null from 90 degree plane, not only from the side , also with a 5 to 8 degree difference in phase you can enjoy 20 to 40 F.B. So the HWF can null the noise in all direction coming from ground wave, simple as that. You can turn the HWF and aim to the DX with good directivity like a 3 elements full size beam from 160, 80, 40 and 30m in one single feed line. The HWF needs to be at least 30 Ft. high for 80m and 60 Ft high for good performance on 160m. Even on 40m and 30m the HWF offer the same noiseless performance. I called noiseless because with 90 dB attenuation on ground wave, mainly man made noise, the noise level during the day without propagation noise or sky wave is below the noise floor of the receiver. The challenger is to avoid any common mode noise pickup from the feed line, the feed line is a vertical antenna and it will deteriorate the vertical attenuation if you don't choke it, not that shield is our enemy for that. Quad shield just increase the common mode noise problems. I recorded some signals comparing a good RDF vertical HF, is my main antenna for almost 10 years, I built on in 2006. The results speak for itself, it is a booring 10 minutes video and at the end somebody started a huge intentional QRM on top of the DX, unbelievable bad in all aspects. It is my Drop box https://www.dropbox.com/s/xqrtj86jout29ph/MVI_0075.MP4?dl=0 Another solution not so efficient because does not have directivity, but works very well is the old K6STI loop >> http://www.angelfire.com/md/k3ky/page45.html Same issue , you need to use unshielded twisted pair to feed the loop, no shield !!! you don't what that on the feed line. 73's N4IS _________________ Topband Reflector Archives - http://www.contesting.com/_topband