Hi. I found this module on aliexpress https://nl.aliexpress.com/item/LEORY-2-w-BLT53A-433-mhz-33dBm-High-Gain-Power-Breedband-Versterker-met-Koellichaam-Voor-3DR/32920277646.html?spm=a2g0z.search0104.3.7.5f6c227fTE1TRL&ws_ab_test=searchweb0_0%2Csearchweb201602_1_10065_10068_319_317_10696_10084_453_10924_454_10083_10618_10920_10921_10304_10307_10922_10820_10821_537_10302_536_10843_10059_10884_10887_100031_321_322_10103%2Csearchweb201603_51%2CppcSwitch_0&algo_pvid=35e4cc0e-5b32-4fa1-b04f-60edab4ccef8&algo_expid=35e4cc0e-5b32-4fa1-b04f-60edab4ccef8-1 im not really sure what it do, is there any1 that is well known with this module?
Power amplifier.
No use with telemetry, since it is only one way.
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Thx for the response. What do you mean with one way? im very new to rf 
I would like to find way to get more range with my boat.
Andras means that it amplifies the transmit signal only and not the receive signal and because MavLink is a bidirectional communication protocol this one way amplifier is useless.
If you want more gain, you should start with the antennas , it is the best best method to augment signal without adding noise.
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Thx for the fast reply and the explanation. Im looking ad 3, 5, and 6 dBi. what would be good dBi for boat? My goal is to get 1km range.
Standard telemetry radio works at several km but I never tried over water on a boat. I would suggest that you use a yagi on shore.
Or change to 900Mhz (or 868 if you in europe) and get an rfd900x radio which is capable of 1W.