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First of all the colours for the image has to be green or light blue, if not the radar will gain more than 65% in-game and the radar won't be visible.
The shape for the radar is to small and undetailed, it has to fill all of the 127x127 pixels and not just 100x86 pixels like in this case.
The horizontal line is misplaced it should go 6 pixels below its current position.
The colour red is not recommended to be used with transparent radars because it receives 25% extra transparency in-game. You should have made it solid type or at least included it here.
You should spend more time designing the image for the radar and not just make it in a short time like this one.
If you have more questions or if you have some free time, go and check my tutorial for transparent radars which can be very useful for you. [LINK]