Bizarre OTA HDTV Reception Problem! Help Needed

I am hoping someone here can offer a simple solution to the problem I have been having with my OTA HDTV reception.

My problem is this:

1. Every time I walk near my RG6 cable the picture on my TV changes (pixelates, freezes or goes blank).
2. Picture is also altered when I touch the RG6 cable.
3. If I move the cable to a new position some stations disappear and new ones appear.
4. Perhaps most interesting - I get signals from most stations even when my RG6 cable is not connected to the antenna. The cable itself is acting as an antenna. Again, picture is altered when I move about the room or when I touch the cable. Reception varies based on the position of the cable - coiled or straight.

I am using Quad-Shield RG6 Cable from Monoprice for both TVs. Obviously, the TV signal is being influenced by my body but the Quad-Shield was supposed to prevent that. Do I need Hexa-Shield cable now?

I don't want to get cable or Dish, but I am sick and tired of messing with the RG6 cable every day. Can anybody shed some light on this situation?

Here is my set up:

TV: Panasonic Plasma - one 54" G10 and other 58" V10.
Antenna: Currently using Monoprice antennas - one for each TV - mounted to the side of my house, 2-4 feet from the roofline. Also tried two different Philips antennas, with the same results.
RF Cable: Currently using Quad-Shield RG6 cable from Monoprice. Also used other brands (GE, Comcast's standard install cable).

That's correct.
Two antennas, one for each TV. I am using the amplifier that shipped with the Monoprice antenna. No other signal boosters or splitters.

I don't know any details about the TVs being grounded. They are plugged into normal wall outlets via surge suppressors. I could get a tester from Lowes to check the wiring in my house.

Actually, I live in Michigan. Just forgot to update my profile after I moved.
I have both antennas pointed in the same direction, since each antenna supports one TV. The TVs do have 3-prong plugs, but the Monoprice amps have just two prongs. I will try plugging the TV directly into the wall and see if that makes a difference.

I am 14-22 miles from the towers. I usually don't get any picture at all without the amps.

Joel Graffman, Advanced Member: The connector at one or both ends of your cable is not properly attached.
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The connections seem tight. I have one coupling in the chain from the antenna to the TV, and that seems to be tight too. Is there anything else I need to check? The coupling was touching the metal door frame but I moved it, and that did not seem to make a difference.

Neither coupling is touching the door frame now. I tried other antennas, but had the same issues. There should be no termination issue as I am using pre-terminated cables from Monoprice.

Is it possible that the cable is not shielded well enough? Perhaps it is picking up signals from the air ....

The cable is not grounded. I just ran it from the antenna to my TV. I am not familiar with 'grounding blocks', but I will google it. Perhaps the local Best Buy / Home Depot has them.

Would the absence of grounding cause the symptoms I mentioned in my first post? Or, are you suggesting I do this anyway?

Rabbit,

Thanks for the suggestions and identifying potential issues with the shielding in my cables. Since I do not have the technical expertise or equipment to test the cables, I just ordered new cables from the Audioholics store. They are well reviewed and have pure copper centers, instead of the Copper-coated-SS in the Monoprice cables. Perhaps that will solve my problems.

I will post an update once I receive and install the new cables.

I am using 'F81 Splice Barrel 2.5 GHz 1.1 Inch' connectors, purchased from YourBroadbandStore dot com. I think they are made by Qintar Technologies. Does that mean anything to you?