Home-brewed Antennas

My antenna system is very simple and home-brewed but effective ( Don't compare mine with BIG GUN's).


Invisible Indoor Antenna


(for Japanese)
このようなアンテナを昔、「鴨居アンテナ」と呼んでいたようです。

- Outline -
Period: Oct. 25, 1998 - Oct. 16, 1999
Frequency: 50 MHz
Output Power: 10W
Place: Sagamihara, Kanagawa

Details(in Japanese)

I lived in a two-story house. This antenna was set just below an attic.

Results

I made QSO's with Korean and Hong Kong stations.

QSL of VR2XMT, Charlie

Dual-band Combined Dipole

In 2000 - 2005, I lived in an apartment house in Fukushima (JA7 area) without my family. This was a first antenna to operate in the days of Fukushima.
Dipole antennas for 15m and 6m with one feeder for both were set at an exterior area of my room.

- Outline -
Period: May 20, 2000 - June 4, 2002
Frequency: 21MHz, 50 MHz
Output Power: 50W (21MHz), 10W (50MHz)
Place: Fukushima

Details(in Japanese)

(note) This picture is intentionally modified.

Elements for 21MHz were bended to stay in the exterior area of my room. A 1.5D2V coax cable was used for easy to handle and easy to wire (through narrow gaps).

Results

As for 21MHz, I made QSO's with 4 continents' except African and Europian.
As for 50MHz, I made QSO's with Korean and Hong Kong stations.

QSL of ZL1TM, Andrei

Multi-band Dipole with Resonant Feeder

I made this antenna system referring to JJ1VKL's article on CQ ham radio (JA) Mar. 2001.
This antenna system could be functioning well above 14MHz.

- Outline -
Period: June 16, 2002 - Sep. 7, 2003
Frequency: HF bands above 14MHz
Output Power: 50W
Place: Fukushima

Details(in Japanese)

(note) This picture is intentionally modified.

Elements were bended to stay in the exterior area of my room. A resonant feeder was made with electric wires and adhesive tapes by myself. An insulation pole was used to push this antenna system out of the exterior area.

Results

I made QSOs with 5 continents' except African.

eQSL of LA6YEA, Norwegian contest club

Long Wire with Fishing Rod

This antenna was set like as fishing out of the exterior area of my room for low bands to high bands of HF.

- Outline -
Period: Oct. 4, 2003 - Nov. 7, 2004
Frequency: HF bands
Output Power: 50W
Place: Fukushima

Details(in Japanese)

An element was 5m long out of the exterior area of my room. An antenna tuner (manually controled) was used to minimize transmission loss.

Results

I made QSOs with 5 continents' except African even on 7MHz band.

QSL of HC8N in Galapagos Is. , Trey on 7MHz CW.

I made QSOs with all continents with this Long Wire.

An online log on the web of 3B9C in Rodrigues I. near Madagascar, Africa.

Vertical Antenna

This was a very simple antenna system easy to operate through 3.5MHz to 50MHz band.

- Outline -
Period: Oct. 27, 1999 - Mar. 6, 2005
Frequency: HF bands, 50MHz
Output Power: 100W
Place: Sagamihara, Kanagawa

Details(in Japanese)

A radiator was made by an aluminum tube of 4m long and set higher than a rooftop. An automatic antenna tuner of ICOM AH-4 was used to minimize transmission loss.

Results

This antenna system was almost free from maintenance at my home QTH Sagamihara during the days of Fukushima(2nd QTH).

	QSL of W7GG, Bob on 3.5MHz CW
	QSL of HA8VK, Joska on 7MHz CW

MicroVert with Fishing Rod
This antenna was small enough for a restricted space but very efficient almost equivalent to a full-size antenna.

- Outline -
Period: Jan. 9, 2005 - Mar. 19, 2005
Frequency: 7MHz
Output Power: 50W
Place: Fukushima

Details(in Japanese)

A radiator was made by a coax cable, not by an aluminum tube(original design).

Results

I made QSOs with Zone 4 (Arkansas, U.S.) for east direction and Zone 16 (Russian Fed.) for west direction.

QSL of WA5VGI, Bill on 7MHz CW He gave me RST 569 that meant big signal beyond my expectation.

Hentenna

Hentenna is a loop antenna of Japanese origin developed by Sagami Amateur Radio Club (JH1YST).
This antenna was simple and small for handy tranceivers of VHF and UHF.

- Outline -
Period: Jan. 2, 2006
Frequency: 430MHz
Output Power: 1W
Place: Kamakura, Kanagawa

Details(in Japanese)

Hentenna for 430MHz

Results

I made 20 QSOs on New Year QSO Party in 2006.

QSL of 7K2XEA The distance to 7K2XEA/1 was about 50km.

Inverted Vee like as G5RV antenna

After coming back from Fukushima, I was making many home-brewed compact antennas for HF low bands. After 2 years trials, I got this G5RV antenna and arranged it to match present-day.

- Outline -
Period: June. 10, 2007 - May 16, 2010
Frequency: HF bands, 50MHz
Output Power: 100W
Place: Sagamihara, Kanagawa

Details(in Japanese)

Because of a wire antenna, it is with almost no restriction to spread wire elements and does not take up too much space.

Results

The sun went through a period of the minimum sunspot number. I made most DX QSOs on HF low bands with this antenna. I had achieved QSOs with all continents by the QSO with LU (Argentine, South America) on 7MHz CW, on July 2007.

eQSL of HB9CVQ, Andy on 14MHz CW He also used G5RV for HF low bands.

Carolina Windom

G5RV is Europian origin and popular in Europe. But Carolina Windom is very popular in U.S. and has a superior performance. And so, I made this antenna to check its performance.

- Outline -
Period: June. 6, 2010 -
Frequency: HF bands, 50MHz
Output Power: 100W
Place: Sagamihara, Kanagawa

Details(in Japanese)

Same as G5RV, it is with almost no restriction to spread wire elements and does not take up too much space.

Results

I made QSOs with LU (Argentin, South America) on 7MHz CW and W (U.S., North America) on 10MHz CW in the phase of tuning. And I made an amazing QSO with XV (Vietnam, Asia) on 50MHz.

	eQSL of UA3MIF, Vlad on 7MHz CW
	eQSL of XV9DT, Eddy on 50MHz CW

Dish antenna for 5cm(5.6GHz)

This dish antenna was made by a skimmer for Chinese food and a pepperbox. Using ready-made dish and horn, an antenna characteristics was not optimum, but it was very simple to operate shortly and easyly in the fields.

- Outline -
Period: Oct. 10, 2010 -
Frequency: 5.6GHz
Output Power: < 0dBm
Place: Machida, Tokyo

Details(in Japanese)

A 5.6GHz handy transverter with the dish antenna.

Results

I made QSOs on 5.6GHz with this dish antenna in the field.

eQSL of JH1YNY on 5.76GHz FM

G5RV

An orthodox G5RV antenna was designed and made for our club station JH1YNY by JR1ATA. Precise sizes were culculated based on original G5RV 's papers. It is very fascinating to me and an old true amateur radio.

- Outline -
Period: Apr. 28, 2012 - Apr. 29, 2012
Frequency: HF bands
Output Power: 50W
Place: Machida, Tokyo

Details(in Japanese)

It is BIG for Japanese compact houses but very fantastic!!.

Results

We used this G5RV on 2012 ALL JA Contest. We got high points and multies that could be expected.


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