“ The HENTENA  antenna “


I built a HENTENA antenna for the 2m band a couple of months ago for a fun of it.  The antenna is not known much among in the north American hams and it was originally developed in Japan by a group of Japanese hams.


The shape is typically a rectangular but that is not all and it has lots of variations.  The top and the bottom elements are 1/6 of one wave length each and the both sides are 1/2 of one wave length each.   There is a bar across connecting to the 1/2 of one wave length of side elements for tuning and adjusting the SWR.  IT IS SIMPLE TO BUILD AND WORKS WELL.  There are a lot of variations in shape and it can be made not only a single element but also multi element antennas (beam antennas).


The information can be seen in the following websites:






The hentena I built:

The materials are all left-over used and on hand materials found in my junk box.  I did not buy any new parts.  The frame was built by welding rods, 1mm diameter.

The design formula:  The top and bottom = 1/6 of one wave,  The both sides= 1/2 of one wave.

The shape:    A  rectangle.

The design frequency:  146 Mhz


The SWR adjustment:

In my case, the cross bar for the adjustment from the bottom is located about 1 inch for the least SWR which was 1.7and for some reason it did not go down further, HI.  Most of Hentena can be adjusted on SWR to 1.1 or 1.2 level.  It did not happen in my case, HI.


The result:

I am not active on 2m band and I had no problem to reach the club repeater, VE3SAR, at 145.370 Mhz.  I tried it in the house as well as outside in my backyard. It did work well.  I live in a small town and the 2m band is always quiet and could not try much.  I like building antennas and try it.  I am satisfied and the hentena met my expectation.  I understand that this antenna has lots variations in shape and easy application from perhaps 15m, 10m, 6m and good for VHF and UHF band.  It is a loop antenna essentially with a SWR adjustment bar built in.  I came across a 40m Hentenna on a website in Japan.  The length on frame does not have to be exact as calculated and also the shape because it has the SWR adjustment bar built in for lowering SWR.  I encourage you to try and make one for fun. 


The pictures are shown in the album of my blog under “ Nov. 26, 2007” for your reference.








In Japanese:

HENTENA ヘンテナ をつくり、遊んでみました。」


日本では有名なヘンテナは、北米であまり知られていません。  以前より一つ作って試してみたいと思っていました。 日本のウェブサイトに沢山見つかり、データやポイントを調べ、2mバンド用のものを作りました。


材料は全部、手持ちの物とジャンクの箱から見つけて揃えました。  フレームは昔、いただいた径1ミリ、長さ1mの特殊鋼熔接棒(マンガンとかニッケルが沢山入っていて、お金を出して買う時はとても高価な物です、HI)、が20本手元に大事にしまってありました。 以前からVHFのアンテナ用にしまっておいたものを使い、圧着端子で棒と棒をつなぎ、フレームを作り、SWR調整用のバーを同軸ケーブルに接続し、ヘンテナにまとめました。 写真をアルバムの20071126日のところにのせてありますので、見てください。



フレームの寸法は正確に作ったのですが、SWRの調整では、どうしても1.7以下には下がりませんでしたが、町のレピーターに接続、実用には支障なく、自分でも満足しましたので、実験を終えました。  SWRを下げるときの調整は面白かったです。 アンテナで遊ぶのは、このSWRの調整の時が一番好きです。




この次のヘンテナはHFの周波数で作って、試したいと思います。  10m バンドがオープンし、QSOが楽に出来る時は、ヘンテナが活躍するでしょうね。






ひろ はやし  VE3CGC



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