: OTA Mounts, Towers, Rigging Hardware
2008-08-08, 11:57 AM
2008-08-08, 11:58 AM
2008-08-08, 04:52 PM
Looks like an old Radio Shack VU-90 to me...
2008-08-08, 05:39 PM
Looks like an old Radio Shack VU-90 to me...If so, it covers both VHF and UHF bands!
2008-08-08, 05:50 PM
So the answer to your question is indeed yes, you can use it no problem (in theory).
Just take the two wires and cut them off near the antenna, attach the balun, and then run RG6 from the antenna into the house to connect to your TV's.
Also, don't forget to check the ground of the antenna, as mentioned.
2008-08-08, 06:55 PM
He just needs one of these Indoor/Outdoor Matching Transformers and some RG6
2008-08-08, 06:57 PM
Even better get an Amp!
and a rotor!
2008-08-08, 11:13 PM
I finally installed my CM 4221 on the side of the house, using 18" Y brackets.
Before the antenna was installed on J mount, 6' bellow the roof line, facing a tree at 2 meters away.
The antenna is ~5 feet above the roof line. I inserted the antenna in the 10' mast and secured it with 2 screws.
I tried rotating it left or right but I get 5 HD channels now, comparing with 14 when antenna was much lower, on the J mount.
Any idea? Is it the weather? I am not even getting all the CN Tower channels.
What I am doing wrong?
Beside the new position, I have another RG6 cable from the antenna to the diplexer. This is ~13' versus the one I used before (4'). Definitely I have more than 50' of total cable.
It's hard to believe I have a short, as CBC is still at 9 bars out of 10. OMNI is at 3 bars out of 10. Before it use to be at 6-7.
2008-08-09, 12:54 AM
wow ty ty so much everyone. Great info, great news. I think i am going to use a grounding rod to ground because my cable and sat is grounded on other side of house.
2008-08-09, 01:26 AM
Check the cable connector on the new cable. If you stripped the cable make sure that you left the braided ground shield wire and folded it back.
Also I find that its easy for one strand of braided wire to touch the copper center. Make sure it does not.
Markham generally has excellent results you must have done something wrong.
2008-08-09, 09:14 AM
Yaamon, don't you think that now my total cable is too long? I realize that this new patch cable is longer than the mast, I guess is around 13'. From the diplexer I have another 50-60' of RG6.
I definitely will check the patch cable connectors. Thanks for the advice.
2008-08-09, 10:35 AM
Markham, even at 60' with a 4221 it cannot drop the signal strength that greatly from what you had before.
2008-08-09, 11:46 AM
"Give to Caesar what belongs to Caesar"!
Yaamon you were right once again .
It was late in the evening when I made the last connection ...
One wire from the ground shield was shorting the inner wire. The OMNI signal went back to 7 bars and after one scan I am getting 3 more US stations: NBC 2-1, NBC Plus 2-2 (weak signal) and CBS 4-1.
I have to realign the antenna as I don't have Global and SunTV.
Thanks again for your support. I'll update my signal and aiming.
2008-08-09, 01:43 PM
After few attempts to get the best signal on all channels, this is what I am getting:
Yaamon, thanks again for your support!
2008-08-09, 05:09 PM
Markham, glad you got it working.
By the way if your total cable run is 60 to 70' then yes a preamp will help with the weaker Buffalo stations with your 4221 like Cbs, Abc and Fox.
Good job, especially in the rain all afternoon. :(
Guess I might see you next week for the preamp. ;)
Thanks for the compliment.
2008-08-10, 04:50 PM
It's not a particularly high-gain antenna but it should work.
An amp and rotor would be a good addition!
2008-08-11, 12:26 AM
Okay, some of you might be stuck with HAVING to use the attic for your OTA antenna, but boy oh boy does it cost you signal strength and cause a bunch of other problems. If you are thinking about it or you have no other choice, at least be aware of the situation at hand. I saw a great post about antennas in attics on another forum that linked to a post on another forum from Bob Chase, a broadcast technician who regularly comments on OTA antennas and stuff over on AVSForum: So, there's no substitute for an outdoor roof or mast mount if at all possible. And as far as good signal reception is concerned, remember what the fighter pilots say: "Altitude = Options".
While I "get-it" when it comes to the attic mount advice, my own experience tells me that there are certainly situations where it is possible to use an attic mount and be "just fine thank you".
I have an attic mounted CM 4221 and my pre-amp is CM 7777.
I get all Toronto and Buffalo stations (~100km from Markham).
I never tried the outdoor antenna route bacause I got a dozen OTA channels with a silver sensor and thus knew the 4221 would do the trick. I use the 7777 to overcome 40m+ of RG6 and RG59 cabling and three tuners connected with splitters.
While sometimes the farthest out stations come and go, it is rare, and usually only lasts a few minutes. My MythTV DVR recording system with ATI HDTV Wonder card is not very resilient to OTA broadcast reception issues, so I am very happy that the signal is good.
Note that I am using a 2x3 metre reflector at one side of the antenna made of material similar to foil wrap to make sure I get one of the stations in Buffalo which would fade periodically without the reflector put beside the antenna. DIY !!! :-)
I have deep respect for your experience and expertice, I've been reading your posts for a long time stampeder!
2008-08-11, 09:33 AM
Hi-Def-Jam-Dr-Jazzy-Jay, with you attic antenna, are you getting MyTV from Buffalo and Global and Sun TV from CN Tower? This is what I am missing with my CM4221, outside installation.
2008-08-11, 10:55 PM
Yes, on another thread (search for my recent posts) I mention that I am receiving all buffalo digital (except 36-1 which I assume is too low power).
I also receive all CN Tower digital as well.
I do not get Hamilton due to the aim of my antenna favoring Buffalo to ensure I get all channels all the time, not just when DX is good...
I must say I do have a very good south view, unobstructed near the house, but at 200ft away there are a few trees about 30 ft above the attic height.
2008-08-14, 10:59 AM
Thanks all but the antenna looks like its been on the roof for about 20 years and bolted to the chimney, how would a rotor work? I would assume i need to loosen the antenna?