UHF Band-pass Filter - Is it bidirectional? SMA connector convention?
The filter is not directional. Passive filters are inherently reversible, though not always cascadable.

The different connectors on either end do not imply any particular direction, they are simply to allow the filter to be dropped in at the end of a cable as a bolt-on, often as part of troubleshooting.

Male is the connector with the pin in the middle.

If you are only using it to try and listen in to some transponder signals while you are on the ground, then this will work fine. ADS-B usually has quite a generous link budget owing to the massive Tx power of the transmitters.