LNR EF-Quad initial test

Well it’s Father’s Day and dads don’t do flowers but they do like antennas. I gave a big hint to my family that I had enough ties and fishing rods, but that I could really use, one might almost go so far as to characterize it as a need, an LNR EF-Quad. And here it is:



Yes, they are a bit expensive when strictly considering the materials but any good products is more than just the sum of its parts. Additionally, the EF-Quad along with the the rest of the LNR family of wire antennas get great reviews on eHam. I’ve watched enough auctions for used LNR antennas on eBay bid up to nearly the same price as new.  It appears that they are desirable and so it was time to jump in.

I attached the end to my Spiderbeam 12m fiberglass pole and stood it up, bungee cording the pole to a picnic table. I deployed it as a sloper so as to allow the tuning stubs to hang freely. There are three tuning stubs on the antenna, one for 10m, the next for 15m, and the last for 20m. The antenna is intended for use on the 10m, 15m, 20m, and 40m bands. It is very well made. I can easily see how some choose to deploy these permanently. I can also see how this antenna would work nicely as a stealth antenna. The antenna wire and tuning stubs are made of Poly Stealth 18 and virtually disappear.

LNR EF-Quad: Quietly giving HOA Busy Bodies nightmares

Where’s the antenna?

This thing would be perfect for those living in HOA-restricted areas. Run a stealth operation at night to get the end well up in a tree and run it back to your shack. Done correctly it will likely never been seen by the HOA cranks when they are out measuring the length of your grass. Little will they know that you are tickling the ether in their controlled airspace.

The total length of the antenna is 65 feet. Just for fun, dust off your trigonometry, a²+b²=c²:



So the matchbox ends up 50 feet away from the base:

Another view

Antenna Feedpoint

I didn’t have time to operate with it but simply tested it with my MFJ-259B, As shown it appears to work as specified:

20 meters

20 meters

On the 20m band the SWR ranged from 1.7 at 14.000 to 1.4 at 14.350.

15 meters

15 meters

On the 15m band the SWR ranged from 2.0 at 21.000 to 1.3 at 21.450.

40 meters

40 meters

On the 40m band the SWR ranged from 1.1 at 7.000 to 2.0 at 7.300.

The 10m band needs some tuning as out of the box the SWR ranged from 4.3 at 28.000 to 7 at 29.7. The instructions state to tune the antenna from 40m down. I’ll need to tune the 10m stub another day and 15m could probably use a bit of a tweak as well. For now though 15m, 20m, and 40m are plenty good enough for initial operation which will hopefully be soon.



One response to “LNR EF-Quad initial test

  1. Good write up, thanks for sharing. Can’t help but laugh at the ‘length of the grass’ monitors. Cheers Andrew VK1AD.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s