This is a great little 500MW Video transmitter for Long Range FPV flight on 5.8Ghz.

You have to use a good antenna system to make this work well for long range.  I recommend a cloverleaf antenna on the transmitter, and a patch antenna or other directional antenna on your goggles.

This system gets decent range running a 5.8Ghz Skew Planar antenna on the receiver as well.

This transmits fatshark and bosom frequencies which is really nice!  See the frequency chart below to make sure that your frequency is on there.