Would it be possible to make a AM rotortiller antenna

[DualAntennas]

Would it be possible to make a similuar shaped antenna
for AM CB 11-meter?

Would it have to be a lot bigger?

ERI - ROTOTILLER Rotofiller Series

 

[Beetle]

Would it be possible to make a similuar shaped antenna
for AM CB 11-meter?

Would it have to be a lot bigger?

ERI - ROTOTILLER Rotofiller Series

Anything's possible. Knock yourself out.

 

[Shockwave]

If you want a complicated antenna that produces half the gain of a dipole, you can make a Rototiler for 11 meters. Just remember is has -3dbd.

 

[2RT307]

Yeah, and then you could co-phase them!

73,
RT307

 

[Lil'Yeshua]

And then you could double your radio's output power and erase that -3 DB

 

[ghz24]

Doubling the power wont increase the received signal like an antennas gain does.
It just gives you a bigger mouth than ears.

 

[Lil'Yeshua]

Doubling the power wont increase the received signal like an antennas gain does.
It just gives you a bigger mouth than ears.

Didn't know that. Well then a receive preamp would fit the bill.
On second thought,it will listen just fine. I have two deep fringe tv antennas vertically stacked with a 2-1 combiner going to a mast mounted signal amplifier going to a 1-4 distribution amp to my tv,etc... It works wonders. Shouldn't that be the case for radio?

 

[W5LZ]

Scale those antennas up to 11 meter size and they would probably produce the same sort of increased listening/talking 'power'. They would be a couple of -very- big antennas though...
- 'Doc

 

[vkrules]

And then you could double your radio's output power and erase that -3 DB

We call that a crocodile ; all mouth and no ears;

 

[Lil'Yeshua]

Well, I was thinking inline with the CP beam antenna plans I have. Just two three element beam antennas. One vertical one horizontal with an advertised gain of 7 dbi. Good receive but would have to double output power or let the antenna's gain take care of that and have a almost nothing gain unless more elements can be added.

 

[Captain Kilowatt]

Scale those antennas up to 11 meter size and they would probably produce the same sort of increased listening/talking 'power'. They would be a couple of -very- big antennas though...
- 'Doc

Yup....that Rototiller antenna (IMHO a stupid name) would look more like a hay rake than a rototiller.

 

[DualAntennas]

how would you go about making a rototiller antenna for 11 meter?
How big would it be for 11-meter?

 

[Lil'Yeshua]

Each half of a dipole are 1/4 wave elements and the velocity factor of the material you plan on using.

 

[Beetle]

The link you posted shows the frequency range. Scale the size from there to 11 meters.

 

[Shockwave]

Scale those antennas up to 11 meter size and they would probably produce the same sort of increased listening/talking 'power'. They would be a couple of -very- big antennas though...
- 'Doc

Scaled to any frequency, this design still has negative 3 db and the dipole has twice the effective radiated power. These antennas are among the very worst in terms of gain and signal. They are desirable because they have been designed to produce very little downward radiation in a circular design. Something that is important on VHF for minimizing RF exposure. Because they have a negative gain you rarely see a single one installed. They are almost always phased and stacked with multiple bays to provide the needed gain.