Hey guys, are these antennas fine to use? The black stuff on the U.Fl connector seems to be in the outer part of the connector. Where does the connector makes contact with the antenna? Just at the middle part? So it is fine to use this one aslong there is nothingh blocking the central part? 

The antenna has  a litte bump at the marked part. Does it lowers the performance of the antenna or is it fine as long its not cut in half?

Thanks in advance.

Just pick the black glue/stuff with tweezers. You don’t have to be extremely thorough with cleaning it all.

The center pin is signal and the outer part is ground.