Its more static volts i think, no danger.
I dont know loads on aerials, but have always been told to earth the braids. They even sell marshaling posts to earth several coaxs at once. If i could find a pic i would upload.
All TV's etc and boosters are double insulated, and have no reference, except coax, and other connections (scart, AV etc).
Below taken from an extract on another forum......
Hope it explains......
I don't intend to get into a long discussion here but it is perfectly normal to be able to get a mild tingle from class II insulated products. This is to do with the need to have the product comply with the EMC rules (electromagnetic compatibility).
In a 3 wire (earthed) product you can couple the chassis to earth; on a two wire product the unit is coupled to both live and neutral with capacitors, typically 470pF IIRC. Thus the chassis sits somewhere around half mains potential all other things being equal and you can measure this with a high impedance AC voltmeter whose other end is grounded. Of course there is no current to speak of (470pF has a very high impedance of about 6 MOhms at 50 Hz) but you can sometimes sense the potential as a faint tingling on the chassis when touched, especially if you touch a grounded product with your other hand. Disconcerting but legal!
HTH.
John Dawson (Arcam)
OK - but I am interested to understand how this can meet the class II requirements of two separate insulation barriers which, if one fails, the other still prevents a shock hazard. If there is a a capacitor between the case and live, and it goes S/C, then the case is live - surely this breaches the requirements? Or - looking through the Farnell catalogue and possibly answering my own question - is it just a case of using class Y1 capacitors, which I guess are designed so that they cannot fail S/C?
However, none of this invalidates the comment I made about removing the earth from equipment that is supposed to have one!
One way to avoid hum loops is to use nearby common ground point and disconnect the screen at one (input) end of each signal connection. The grounding point needs to be very close, since the ground conductors are now part of the signal circuit and any noise on them will be imposed on the signal.
Another way is to use transformer isolation.
And the best is to use balanced interconnections, which don't need an earth reference so you need only connect the cable screen at one end. You can get converters for domestic kit that will provide balanced I/O - worth doing for a long run.