Which Antenna?
 

Hi there!
I am a Newbie in amateur radio and I am on the way to build my
shack/antenna.
Question: Which SW-antenna should I take for good DX'ing?
Vertical/horizontal antenna, beam etc.
The problem is that I can't mount a 20 meter Versatower next to my house.
The only way is my roof which is about 6m from ground.
What is a really good HF-grounding? Is it enough to connect the antenna
mast/tower to the water pipe?
Lots of questions....... ;-)

Thanks
Mike