Tony Cox wrote:



It seems like a misleading ATIS instruction. I've often heard
"Clearance and Ground combined on xx.xx" but never "all
frequencies".

It was confusing. And when all the freq's are combined they should
always be combined on the approach frequency. We do this every night
after 8 pm and it stays that way until 6:30 am the next day. The ATIS
broadcast will say "All aircraft contact Billings 120.5..."



Arden's question isn't easy to answer anyway. If I were approaching
Monterrey (MTR), class C, approach is handled by a facility in
the tower on the floor below the guys looking out of the window.
If I heard "all frequencies" from MTR, I'd assume it means approach
too.

And if it wasn't I would question the controller right there.