A pre amp should be placed as near to the antenna as is possible, if it isn't then any signal lost in the cable can't be amplified. This unit certainly doesn't look water proof / resistant so would only be able to be fitted say in a loft on an internal antenna. Another concern is the wide frequency response, again not saying it won't work but I use the WiMo sealed unit specifically centered on 1090.
There are other threads where you will get a 50/50 split between the yes they are good and no they aren't.
If there is no signal reaching the antenna then no pre amp in the world will help.
Concentrate on getting a hi dB gain antenna as high as possible in the open for best results. Adding a pre amp to that MAY give you some benefit.
Hope that helps.
