[squarefoot]

"It's quite easy to jam satellite comes"

That would literally require a man in the middle attack; the jammer should be kept between the antenna and the satellite, or very close to that position. I mean, it should be in the air.

"as well as locate them"

Possible, but not easy. A satellite dish can be buried, hidden under a camouflaging roof etc It's not like earth antennas that need the space around them free for pointing them; all they need is to see their satellite which is in the sky. One can dig a hole in the ground, put the dish down there pointed to the satellite, then when not in use park their truck above it, and good luck to the government helicopter passing above to track it. And btw, there are ways to build antennas that don't appear as such; they may offer worse performance but they do work, and satellite reflectors can be built that way too.

[QuarterReptile]

The location finding would be by RF emissions, not visually.

[squarefoot]

That's my point. A dish antenna is highly directional, so an tx/rx antenna pointed towards the sky can be detected/jammed effectively only by standing in between the antenna and the target it's pointed to, ie the satellite. It's not a thin line, but it's still a limited area, and the minor lobes of its radiation pattern produce a very faint signal which can become negligible by burying or covering most of the dish in all directions except the one it's aimed to.