I made the ugly balun which I believe is a 1:1 choke?
Can't hurt, but an ugly balun is often not as effective as a ferrite one. http://www.karinya.net/g3txq/chokes/
Also I'm concerned how far reaching this RFI is.
It's not what you're transmitting, it's what the affected equipment is detecting. How sensitive something can be to RF energy is dependent not only on the intensity of RF but also how well the item is shielded and isolated, and how the end user connected it.
I'm worried I could be effecting my neighbours equipment.
I wouldn't. I suspect if it's ever a problem you'll find out about it.
I turned the drive way down and still could hear it on my speakers.
That just means you have especially sensitive speakers. I have several sets of amplified speakers on PC's and a surround speaker set on my TV. I've never bothered them.
I guess the only solution would be to put the antenna even higher
That's a win-win for you.
give ferrites to everyone around me so they can put them on their speaker wire?
Technically it's up to them to come up with and pay for any remedy. You can be a nice guy and do that but that's a form of implied guilt. First thing I do is point to the Part 15 notice that's on just about everything these days. From there we can work on an amicable solution.
I've read of other people using dipoles such as this in their attics or under an eaves. I would have to guess they've had the same issue?
Any time you have an antenna that close to or inside a structure, the field strength will be that much higher plus there's more opportunity for energy to couple into power and signal wiring.