April - June is really the time to see Broadbills. Funny how it is but I can go throughout the dry season only seeing the random bird. Then when the wet season starts the birds seem to suddenly 'appear' in the area between the 3 streams at Kaengkrachan. Especially Silver-breasted becomes easy to spot as it often build its nest close to the road.
Black-Red Broadbill is always found nesting over some water with its nesting ball hanging from a thin twig.
With both these species I used a portable blind.
The female has a nice silver necklace.