The BAZOOKA Antenna

[BlackBeard]

i found this in an italian forum ,from coaxial ,i dunno if it the same .

What about this design? I actually want to build this colinear coaxial antenna as I'm interested in the 6dBd gain. Alternatively, I looked at this design: https://jeroen.steeman.org/Antenna/collinear-coax - with 6 λ/4 pieces and a rf-choke at the bottom. What do you recommend me?

[EFR]

I have build couple of those.

Use shitload of glue or something to seal all coax ends.

[BlackBeard]

I have build couple of those.

Use shitload of glue or something to seal all coax ends.

Thanks EFR! Did you use the italian design or just a couple of λ/4-pieces?

[EFR]

I have build couple of those.

Use shitload of glue or something to seal all coax ends.

Thanks EFR! Did you use the italian design or just a couple of λ/4-pieces?

Yeah, and old German one from physical book displaying antennas.

They work well, easy to tune, but mount is so that it wont move inside tube that you are using.

And use glue at the ends of coax, my first on failed after couple months even tube was open from lower end. Never tried to use heatshrink tube that has glue on it. Hams seems to use it overthese.

[Albert H]

The coax colinear can be very effective, but at Band II makes for a huge vertical! Practically, if you can build the phasing harnesses, stacked dipoles or Yagis (if you want shaped coverage) are the easiest gain aerials. One of my most effective (in California in the 80s) used stacked "H" Yagis to give shaped coverage into a city from a neaby mountain.

The dimensions for 4m or 2m versions are in the ARRL Antenna Handbook, and the matching harnesses and feeder configuration is well explained. You just have to scale for your frequency of choice!

[EFR]

Yagis are also easy to build, or I think so.

HB9CV needs little work to get match.

Moxon works always at first try.

[Albert H]

The Moxon is a pretty good choice, too.

I used to find that a simple coil-loaded ⅝ or ⅞-wave vertical (according to the required take-off angle) was easy to conceal as it doesn't look like a "pirate" aerial, and the match and coverage from them was excellent. They also had the advantage of very low downward "spill" making the field strength in the block and immediately around it very low, avoiding causing overload problems in the resident's FM receivers, and confusing the stupid wannabe rig thieves!

[BlackBeard]

The Moxon is a pretty good choice, too.

I used to find that a simple coil-loaded ⅝ or ⅞-wave vertical (according to the required take-off angle) was easy to conceal as it doesn't look like a "pirate" aerial, and the match and coverage from them was excellent. They also had the advantage of very low downward "spill" making the field strength in the block and immediately around it very low, avoiding causing overload problems in the resident's FM receivers, and confusing the stupid wannabe rig thieves!

Thank you very much Albert! Nice that you mentioned the ⅝ and ⅞. I was actually thinking a lot about those. I brainstormed a little and figured that they're probably the most suitable solution for my situation. I'm broadcasting from a high site - above the region. I opened a new thread for that