Noobie question Calc on checkbox field

[Dusty_Rods]

hi guys,

I have a checkbox set defined on a field called media.

the options are

local newspaper

local radio

National newspaper

National radio.

I am doing a report and I need to count the number of local media.

So i have a summary field that looks at the calculation however i cant seem to get the calculation working. If i use and if statement doesnt that mean it returns only one per record where if both local radio and local newspaper are selected it should return two.

Thanks for Looking,

D