Installed a discone antenna on my roof a few weekends ago – I had a lot of help from my FIL:
I later took it down, as we had some frightening lightning storms roll through over the week after this antenna went up. I had yet to install a ground on the coaxial, and did not want the house to burn down in the event of any lightning strike. Perhaps I was overly-concerned. Maybe not.
I did receive significant improvement in signals – I could pick up four counties instead of just two. This antenna was connected to a hand-held Uniden Trunk-Tracker scanner.
Get into ham radio – it is fun, and you can learn much. As well, you can keep in touch with those you care most about.
I am looking forward to getting some better cable, and if I put the antenna back up, will improve my grounding – not just a rod, but a system.
The only thing I would add is that RadioShack discones are not very sturdy. The Nylon base of the whip cracked while the antenna was in storage – not even exposed to the weather outdoors.
When talking about grounding systems, reference is often made to multiple ground rods connected together, and certainly a ground on the coaxial, often to the house ground itself. The key is keeping energy out. Lightning is not your friend.