How can you get better than 100% shielding? The only time *heavier* shielding would be of help is when there is *substantial* current flowing in the shield. OTOH if there is substantial current flowing in the receiving antenna shield something else is seriously wrong.
That certainly has not been my experience.
In reverse order: Part measured with an HP spectrum analyzer, observing measured data rates, and listening with very sensitive receivers. In addition I've seen no observable interference on the TV or heard any on the radio during checks.
As to practice: They are all signal leads (with the exception of the rotator and remote antenna switch control leads and both are low voltage) and are according to code. All shields are grounded at the base of the tower and they are grounded to the tower at the top, or where the cable starts down the tower in the case of the TV, Dish, and side mounted antennas. Those shields are again grounded at a bulkhead where the cables enter the house. Also at that point are a number of Polyphasers So to recap, the coax shields are grounded at the top of the tower, bottom of the tower, and where they enter the house. All leads are the same length from the tower to the house which minimizes the likelihood of a voltage build up between them during a lightning strike.
One additional note: All of the radio station coax is 100% foil shield plus braid as well. All runs are either Times Wire LMR 400 or LMR 600
This is the antenna setup.
The satellite dish does not show in either photo, but is on the same side of the tower as the white vertical and about level with the roof line. I'll eventually get this photo updated.
Behind the black C-band dish is a smaller tower with a 7 through 50 MHz vertical on the West end of the shop. There is a crossed, folded dipole (which doesn't show) right at the base of the vertical for the HD TV tuner in the shop computer.
The old antique station has been rebuilt with the exception of the transmitter. It is capable of running the legal power limit. There is a much smaller transceiver that drives an old Henry 2K4 amp (not shown) that I normally use.
Although the station sounds elaborate, most of the equipment was purchased used (some like the 2K4 had to be rebuilt to work) and I did all of the tower work myself.
There is a substantial buried ground system that has 32 or 33 (lost count) ground rods CadWelded(TM) to the cables tying everything together into what is called a single point ground system or as near so as possible. .
It meets code and works well. Besides to get that 130 foot run from the house to the shop leaves little in the way of alternatives. My only real concern for the Gigabit network is lightning as the tower has taken an average of 3 visually confirmed direct hits a year since it was installed. It took five hits this past summer I'd go wireless but it's just too slow for the amount of traffic I put on the network. I was operating this computer when the last strike occurred (Wireless keyboard and mouse). All 4 computers on the network were up and running and I had a large file transfer going between the computer to my right and the one in the shop. When the lightning hit the lights blinked, the UPSs squealed, the network went down, right back up, and continued the file transfer.
BTW with that many visually confirmed hits I wonder how many times it actually gets hit.
The point behind all of his is: Proper termination and grounding along with good coax allow this system to work well in an environment far more severe/hostile than most will ever experience.
Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair)