stacking Mohu Leaf TV antennas

[keeney123]

I wondered it anyone ever tried stacking two Mohu Leaf antennas either vertically or Horizontally to decrease interference from cars in a city?
I have used aluminum screening to shield incoming signals from entering through the lower portion of my window and I have used a aluminum screen to shield the back portion of my antenna. All aluminum I have tied to the electrical ground. I have also used a 2 uF cap in series with my antenna and a 75 ohm resistor with a 2000 pF cap across the input to the antenna to ground of the antenna. The 2000 pF was the smallest cap I had available. All these things have improved my reception greatly as I live on a busy four way corner that has traffic antennas that trigger the stop light. There is buildings all around me and I live in a low spot. All that said I improved my reception from 10 channels to 29 channels and I improved these channels from constantly going off and on to going off occasionally. Cars and weather have an affect now that I get pix-elating and the sound goes out. I just wonder if two Mohu Leaf antennas set 1/2 wavelength apart would cancel out the interference or does this only work with directional antennas?

[stj]

Re: stacking Mohu Leaf TV antennas

it may be worse,
if the 2 antenna's pick the same signal up with a slight time offset and combine them you could get data corruption.

you didnt mention it, but i will - you can make a hell of a difference to digital tv signals by using decent double-screened cable.
the type intended for sat dishes with a copper screen and a decent copper braid such as CT100.
NOT the cheap junk the big installers use with aluminium-coated plastic screen and light copper braid.
although either will be an improvement on regular RG6 type tv coax or worse.

[Alastair E]

Re: stacking Mohu Leaf TV antennas

Why not put up a good Yagi type antenna...?

I doubt that flat leaf thing has much in the way of gain!

[stj]

Re: stacking Mohu Leaf TV antennas

you dont need much gain with digital stuff, you need to minimise rfi and crap from nearby wiring.
it's all about keeping the BER down.

[Alastair E]

Re: stacking Mohu Leaf TV antennas

you dont need much gain with digital stuff, you need to minimise rfi and crap from nearby wiring.
it's all about keeping the BER down.

Absolutely! --Saying that, A Good strong raw signal and let the Tuner's AGC take care of the rest, and down goes your noise as it accomodates a strong signal!

You're right about the downlead though--There's SO much crap cables around, sure to kill a digital-signal!

[stj]

Re: stacking Mohu Leaf TV antennas

http://www.megalithia.com/elect/cable/index.html

[keeney123]

Re: stacking Mohu Leaf TV antennas

Why not put up a good Yagi type antenna...?

I doubt that flat leaf thing has much in the way of gain!

The problem with a directional Yagi is you have to get up every time you switch your TV station to adjust your antenna. This is also an indoor antenna if you did not know. I also live with-in less than ten miles of all the stations.

[keeney123]

Re: stacking Mohu Leaf TV antennas

[QUOTE=stj;542618]it may be worse,
if the 2 antenna's pick the same signal up with a slight time offset and combine them you could get data corruption.

you didnt mention it, but i will - you can make a hell of a difference to digital tv signals by using decent double-screened cable.
the type intended for sat dishes with a copper screen and a decent copper braid such as CT100.
NOT the cheap junk the big installers use with aluminium-coated plastic screen and light copper braid.
although either will be an improvement on regular RG6 type tv coax or worse.[/Quote
The reflection signals off of the vehicles are out of phase with the steady state signal I believe is causing my problem. The vehicle reflection signal is canceling out the TV signal that is steady state from the tower. Setting the antennas apart one would hope that the steady state signals would amplify in phase with one another while the vehicle reflection would be going from a different direction as the tower signal, which comes aligned with the antenna, so at this different angle one antenna would pick it up sooner and the other later which would have a tendency to cancel each other out. At least this is how a Yagi works. Were in the USA can one buy this CT100 cable?

[keeney123]

Re: stacking Mohu Leaf TV antennas

So after contacting several people in the department of transportation I have found out that there is a thing called ( Transit Signal Priority Systems) it is their signals that are interfering with my TV reception.There antennas are on a telephone pole diagonal to my apartment across the street. They told me next month they are going to a different system. I notices today they have changed the antennas, but with no improvement in reception. Channel 4 in Seattle is 200 yards away from my apartment on the same street. I get a digital signal strength of 100% and the Quality is 79%. Every time this (TSPS) triggers my picture looses the signal. The Strength goes down to 95% and the quality goes down to 0%. Being that Denny Way is a busy street this is happening quit often.