"Channel Jumper" wrote in message
...

I don't understand the type of antenna he / she built.

A half wave what? J Pole?

A little secret - take a television antenna - UHF / VHF, turn it on it's
side if you want. You can even use a antenna pre amp. USE a antenna
rotor.

Connect the antenna to some good RG 6 Quad Shield and run it into your
house, into the power injector, into some more good Quad Shield and
adapter to BNC.

Turn the antenna in the direction you desire to receive in.

I used a Winegard 8200U antenna and a Channel Master CM 7777 pre amp and
Channel Master rotor @ 24' in my backyard and was able to hear stations
that I could not hear with my Yaesu 8900 and my Diamond V2000 antenna
nor my Cushcraft 4 element 2 meter beam antenna.

If all you want to do is receive, it does not matter if the cable is 50
ohm or 75 ohm nominal impedance.. You are not going to get standing
waves from reception - only transmission.

Even better cable is the hardline that the TV cable company uses from
pole to pole. I think its nominal resistance is about 77 Ohm's, but its
loss rate is . 07 or something or another in like 100 feet @ 500 Mhz.

Enjoy the scanner, do not expect to hear much with a home brew vertical
dipole antenna.


You'd be surprised. I built (actually, adapted) an offset-fed dipole from
an old rabbit ears (the kind that comes with the set) which is in my 2nd
floor 'shack'. Does a decent job across multiple frequencies.

HankG

It does a decent job compared to what?

Because you have no other antenna to compare it to - all you know is what you got locally with the rabbit ears...

Technicially it is not called SWR - sorry that is CB lingo - for the people who knows nothing and doesn't care to learn anything..

In communications we call it VSWR - since all we are concerned about is the VOLTAGE present.

power from a generator ( transceiver ) is measured in volts and amps which when multiplied together equals WATTS.

power from a antenna is measured in MICROWATTS....

How much of a standing wave are you going to generate with 10 microwatts?

Even still more - the SWR as you call it is not as important as the loss rate.

450 ohm ladder line could have a VSWR of 20:1 - yet have very little outcome on the performance of your antenna system - because the loss is very low in 100' @ 7 MHz.

Its only as we increase frequency that we concern ourselves more with loss.

140 something megacycles is not all that bad when it comes to line loss.
440 MHz on the other hand is a whole different story...

I would suggest that you do a little more internet research....