What antenna?

No, you don’t need them, especially for light bar setup. You can always solder them your self if needed later on for PCB.

Is it worth buying an antenna on aliexpress?

The BT-3B45AJ looks like the U-Blox ANN-MB-00

Are these antennas as good as u-blox?

U-Blox is what everyone uses. Maybe yours are the same maybe not but in terms of price it feels that they are the same price as the ones we buy from here:

Takes 10 minutes and 1-2 eur worth of pins and you save 25 eur.

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