Homemade quarter-wave ground plane base antenna

**Jay Mojave** · 11-10-2016, 10:15 AM

Hello M1989: Great looking install there glad its ah hummin and buzzin for you. Kind of nice to have such a low SWR.

26 Feet 6.2 inches sounds a little too long, did I get that right? Is it possible to get the bottom 1 1/4 inch tubing length? Its not given in the assembly instructions. But the older Penetrator Bottom Tubing length was 71 inches.

Thanks for any help here.

Jay in the Great Mojave Desert

**mattsowders1989** · 11-10-2016, 10:17 AM

22' I'm sorry. Not 26'

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**Jay Mojave** · 11-12-2016, 08:40 AM

Hello M1989: A big thank you, greatly appreciated. I changed the batteries in my caculator as I was trying to make the lengths fit. Even cleaned ny glass's. Good to hear its working for you. Thanks again.

Jay in the Mojave

**mattsowders1989** · 11-13-2016, 11:40 AM

its a hell of an antenna. using a cobra 29lx going into a typhoon 150, that is driving a heathkit sb-200. im putting out about 800 watts and im being told that i sound really good out there. thanks guys for all of your help. i thank each and every one of you! and thank you doughboy for the typhoon 150!

**source** · 01-06-2017, 12:52 AM

1\4 wave has no gain use sigma or vector 4000 updated to the sigma .very effective.

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**222DBFL** · 01-06-2017, 05:57 AM

Yep. Run a vector 4000 myself. Good antennas if and I say if due to the length, you don't live in a high wind area. Another great antenna that is getting a lot of attention is the Hy-Gain SPT500. Good antenna as well. And if you want something you can run more power through, look at the US made Shockwave antennas. They aren't cheap. But they aren't built cheap either. JMHO's.

**BOOTY MONSTER** · 01-14-2017, 08:00 AM

vector 4000 is a great antenna ... if you have the space and mild weather for it ... and the budget . but folks have talked around the world on 1/4WGP's , they can be very effective !!!

**JAF0** · 01-25-2017, 02:52 AM

Yeah, that SPT-500 (NEW-School Penetrator) is a thing of beauty!

Does the entire antenna from bottom of coax connector to tip of top hat rods bolt measure right at
22' 6"?

I run an original 1975 Penetrator-500 by (Pre-MFJ) Hy-gain and had to shorten it about 2" from 22' 9.5" to 22' 7.5" total to get it flat from 10 ch below ch1 to 10 ch above ch40, centered on ch19, middle of the band because it centered right at 27.000 out of the box at 22' 9.5".

Appears the new version is real close, differing by only an inch or two. That's good because my original kicks arse!!