List unique column values from table in new table

I'm using the following formula to get the unique values of Column J from another sheet (named "Data") and listing those unique values in Column G on the current sheet.

=IFERROR(INDEX(Data!$J$2:$J$71,MATCH(0,COUNTIF($G$21:G21,Data!$J$2:$J$71),0)),NA())

Its working fine as is, but i would like to make a few tweaks and cant get it figured out.

I'd like to:
1. Only lost the unique values that show when the table is filtered.
2. If possible, not have to set a Column G range in order to avoid blank (N/A, or just just unnecessary) rows in the new table.

Thanks

I typically use Excel Advanced Filter. You can get a Unique set of values in a different column (my preference is to then sort the unique values- visually easier to work with). Go to the following tab: Data > (under sort & filter). Highlight your LIST RANGE, > click the radio button Copy to another location - then in the COPY TO pick where you want the new Unique values to go > Click the UNIQUE RECORDS ONLY check box > finally hit OK. It's fast an furious....I hope you like it.. Thanks