Ken Bessler wrote:
I just built a 3el 6m quad. Should I put a choke or balun
at the feedpoint? What type?

A few turns of coax will do the trick for 6m.
How about this solution from an earlier posting?

|
|
| Driven
| Element
|
+====================================coax braid

+------------------------------------coax center conductor
|
| ==============================+===coax braid
| spacing |
+--------------------------------+
| 1/4WL wire (~4.7')
|

--
73, Cecil http://www.qsl.net/w5dxp