How Should I Install Radials for My Low Band Vertical ?

I always wondering, how should I install radials for my HF vertical antenna optimally. I don’t have a large enough room for installing full-size ground radials / buried radials even for a 40m band let alone for an 80m band vertical antenna. Therefore, I investigate this topic through analysis on 4NEC2 and try to find…

Announcement About Solar Cycle 25

I am not a solar scientist so I will keep it short and not make any scientific comment about it. On the other day, I read an article about solar cycle 25 here, and it appears to be The Solar Cycle 25 has begun. That article briefly talks about the first sunspot and solar flare of…

An Interesting HF Station

A few weeks ago, I traveled to Jakarta to visit PT. GMF AeroAsia, Tbk in the Soekarno-Hatta International Airport (CGK) complex. On the way to get there, I saw an interesting scenery: a quite large shortwave station. When you drive by Marsekal Suryadarma Road, you can easily tell where the station is located just by…

40 m Band Vertical on Steroids

-part 4 Being the last part of about vertical antenna above sea water (see part 2 & part 3), we will discuss 40 m band vertical antenna which configured as 2 x 2 parasitic array. As shown in part 2, a vertical antenna with 2 elevated radials situated above seawater has a peak gain of…

Matching An Antenna – Reader’s Question

Before continuing the series of the vertical antenna, briefly, I want to answer a question from one of my reader. So, a few days ago, Mr. Hery asked me this; “Mr. Han, I built a short hatted dipole antenna and I got impedance measurement of 15-j28 Ohms, how do I match that to 50 Ohms ?” Well, Mr.…

Resizing Your Antenna for Another Band

-part 3- In the previous part, we talked about vertical antenna for 15 m band, while in the first part, we talked about 40 m band. Not so consistent isn’t it ? Well, let’s convert our 15 m band vertical antenna for 40 m band operation. Actually, converting/resizing an antenna for another band is pretty straightforward, especially if…

Overload Your Vertical Antenna

“…It’s a neat trick !…” -Fred Harris- -part 2 In the last article, we’ve seen that under typical ‘newcomer’ installation conditions, vertical antenna potentially perform better than the inverted-Vee antenna. But, there are two weaknesses of the vertical antenna; 1. The vertical antenna needs a very good ground system installation (not trivial) and 2. The vertical antenna that…