CM 4228 Mounted Sideways?

[kelton325]

I am thinking of buying a CM 4228 for an attic mount, but due to low clearance, it might have to be setup sideways. By sideways, I mean, positioning it so that the side that would normally be on top would be moved 90 degrees in one direction. I would still face the antenna toward the transmitters.

Would this mount affect reception?

 

[Mike500]

It would be terribly weak. The probagated waves would be received about 90 degrees off.

 

[NightHawk]

Agreed. The transmit polarization is generally horizontial, requiring a matching antenna orientation.

 

[Rick0725]

The antenna is very close to square length an width. What is holding you back from mounting outside?

 

[roashru]

kelton325, to give a better answer to your question you need to tell everyone the digital tv rf channels for your area. a layman explaination of how polorazation happens the higher the frequency of the channel the more the rf transmitter enforces polorazation.

 

[Rick0725]

The cm4228 measures 39.5" across by 36" up and down (just measured one). We are only talking about a 3.5" here.

Installing sideways will be 3.5" taller.

 

[gbranch]

Just an example of polarization at work, try connecting a standard tv antenna to a police scanner. You won't get much. Rotate the main axis of the antenna by 90° so that the elements point up and down, and it works magnificently.

Television signals are horizontally polarized. VHF and UHF narrowband FM transmissions are vertically polarized. I believe that FM broadcast signals in the 88-108 MHz band are transmitted in both polarizations.

I have a Radio Shack U-75 UHF yagi, rotated vertically, that I use to receive my local town's 800 MHz trunked radio system. Works great.

You will be disappointed if you try to rotate your 4228 to vertical polarization.

 

[roashru]

information: gbranch, if you dont have a P25 radio your missing a lot.

 

[kelton325]

kelton325, to give a better answer to your question you need to tell everyone the digital tv rf channels for your area. a layman explaination of how polorazation happens the higher the frequency of the channel the more the rf transmitter enforces polorazation.

Here are the channels I am after:

13
14
21
36
46

 

[Rick0725]

kelton325

The cm4228 measures 39.5" across by 36" up and down . We are only talking about a 3.5" difference here. Its bigger across. And you have a clearance issue? Which way?

kick me, cause I do not get it...what is the issue

What do you tend to gain by mounting the antenna sideways

Installing sideways, the antenna will be 3.5" taller.

 

[kelton325]

Rick0725 - you are right, I think I must've misread the specs somewhere... I was thinking that it was 39.5" up and down. I think I might be OK to mount it up and down in the attic.

Thanks everyone for the posts, sorry to kick off a debate based on my misreading specs!

 

[KSbugeater]

If installed on a mast, the 4228 is taller than it is wide. See here:

http://www.hdtvprimer.com/ANTENNAS/cm4228.html

 

[Rick0725]

Model CM4228
Antenna Width 39.5"
Antenna Height 36"

from cm web site and my measurement of stock. So lets move on.

Thanks