wrote:

* Is "bunched" or "flat" better?
* Are they basically single-band or wide-band or somewhere in-between?
* Are there "rules of thumb" to make them for hams with
* No test equipment?
* A grid-dip meter?
* A noise bridge?
* An antenna analyzer?

Possibly this has been posted previously...but just in case:

http://www.bcdxc.org/balun_information.htm#Ed,%20WA2SRQ

Measurements of practical baluns of various types using an HP Vector
Impedance Meter. It should answer most of your questions above.

73, Bill W4ZV