Although including other bands, there are many nice information in short clear form, of antennas that will work well on 30m from OM Martin SM0DTK, have a look here:
Hi all
I joined this group but I very rarely hear VK on 30m. This band is plagued with noise in 9V and is almost unusable except when conditions are exceptionally good, which is very rare indeed these days. 9V1YC reckons it could be hash from street lighting. We just don't know. I will keep an ear open.
de John 9V1VV
Hello CW Aficionados,
The winter mornings here in the north west corner of the United States are quite interesting. About the time that JA is heard on 40 meters, the German maritime RTTY signal on 30 meters arrives, announcing the opening on 30 meters into Europe. I heard a French station calling CQ SKCC and an Austrian - on my poor, NVIS antenna and my noise cancellation bridge, due to local RFI problems.
I hope to erect a 30 meter, elevated radial vertical antenna soon (or maybe a half square ), so that I can enjoy this wonderful band more.
73 de Ray W7ASA
Cannibalized the G5RV turning it into a delta loop for 10.125 MHz. Rather than pouring an RF cup of tea on 80-10m, I’d rather be a shot of whiskey on 30m ;)
The new 30m delta loop fits nicely in the same location as the G5RV with the feed point at 6 ft. AGL, putting the top of it around 35 ft. AGL. The antenna is oriented to provide peak lobes E-W, although the house is pretty much blocking it to the west, and this configuration is modeled as having a 45 degree take off angle.
When matched with a 1:1 balun, the impedance at the feed point is 100 ohms with an SWR of 3.2. After trimming to resonance and matched with a 4:1 balun, impedance at the feed point drops to 30 ohms with an SWR of 1.6 and a capacitive reactance of 0.
Next I “squashed” the delta loop: lengthening the top (relative to the sides) and this raised the impedance, providing a better match for the 4:1 balun AND getting more of the antenna higher up in the air (see below). We’ll call this “Configuration A1” for a future test which is ideal for a setup in the backyard.
Finally the delta loop matched up at an SWR of 1.0, impedance at the feed point of 44 ohms, and a capacitive reactance of zero. Connecting it to the radio, I picked up Poland and Greece, which is the first ever DX I’ve received on 30m. The antenna handles 100 Watts and the SWR needle doesn’t move.
73, Matt KE7EX
This is excellent news Matt. Very encouraging. Am also thinking of experimenting with a quad loop or delta loop. My first experiment years ago with one didn't work out, I didn't have enough space. Keep us informed about any DX you manage with it and its general performance, would be very interesting to know. Also noise levels, hopefully it's quiet?
Here’s some additional info from the 10 MHz Delta Loop series (across the 1 year it was on the air from Grid Square FM19). Thanks to all of you for your QTT QSO’s:
Photo of Delta Loop “Config A1” “squashed” provided excellent match and solid single-hop reports out to 1,000 NM.
https://www.dropbox.com/s/ym1fvt1j5akrnh3/30m%20A%20loop.png?dl=0
Photo of Delta Loop “Config E1” “equilateral” fed at top corner with 300-ohm twin lead, slightly farther reach to the West.
https://www.dropbox.com/s/jondr62jbeil0f3/30m%20%CE%94%20Loop%20%28E1%29.jpg?dl=0
I found the following charts helpful in building these antennas:
https://www.dropbox.com/s/f1yrbzlo55ebkf2/balun%2041.jpeg?dl=0
At our new 3rd floor apartment QTH we are presently running a 10 MHz Vertical against four ground radials. Radials are tuned with the MFJ-931 Artificial Ground:
https://www.dropbox.com/s/z5pudvx78s6pbfz/IMG_6453.jpg?dl=0
Receive antenna is a Chameleon RXL:
https://www.dropbox.com/s/m2f9h58q0z4pwis/IMG_8243.jpg?dl=0
We also on occasion run this stealth 10 MHz EFHW as a transmit antenna across the roof of the apartment building:
We also enjoy operating 10 MHz Portable QRP with a QRP Guys Tri-Band Vertical:
https://www.dropbox.com/s/7kbu4e1bbigjtqa/P-QRP%2030m%20Vert%20%2823SEP2019%29.jpg?dl=0
Looking forward to reporting back with the radiation pattern plots compiled from another 1-year’s worth of 10 MHz QSO’s from these transmit antennas.
__ … __
73, Matt KE7EX
Just looked at all the links, thank you! Am also thinking of the QRP guys 3 band EFHW etc. May take a while to get back on air but worth dreaming about meantime!