Background masking / jagged edges

was wondering about how i get jagged edges sometimes when masking out a background.
i'm working on a document right now that is 59" x 39" at 72 pixels / inch resolution.  when masking out some areas of the background, i notice jagged edges around the parts of the document that i want to see (or not masked out).   is this due to the image being at 72 ppi?
i don't always have this happen, and i'm wondering if the difference is b/w images that are 72ppi and 300ppi.
also...in order to avoid the jagged edges, is it best to feather the selection a bit (i.e., 1 to 2 pixels) before applying the mask?
thanks in advance for any feedback!!

hey, zeno...
yes...i am using the pen tool, and the anti-alias box is checked.
i'm going off memory here....but it seems different results happen when using the pen tool, making a selection, then deleting the unwanted image as opposed to masking it.  i typically use the pen tool and don't always get jagged edges.  i'm trying to figure out what causes the difference.....or maybe i'm crazy...

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