Full Idea
We can say that non-Fregean content [reference] is (virtually) always contrued as broad, while Fregean content [sense] is usually contrued as narrow.
Clarification
'Broad' content involves things outside the mind
Gist of Idea
On the whole, referential content is seen as broad, and sense content as narrow
Source
Peter Schulte (Mental Content [2023], 3.2)
Book Reference
Schulte,Peter: 'Mental Content' [CUP 2023], p.13
A Reaction
I can't make sense of mental content actually being outside the mind, so I see all content as narrow - but that doesn't mean that externals are irrelevant to it. If I think that is an oak, and it's an elm, the content is oak.