I had a set of TP-Link 6dBi antennas that I bought over 5 years ago. They worked well; but 10dBi is better than 6dBi so why not upgrade? I had extra money. The new and old antennas were made the same way. Both offer a signal quality of 86-83% and limit the speed to 144.4 Mbit/s to the base station. The maximum throughput of 802.11n is 150 Mbps, so I really can't fret about 144.4, which is 96.2% of the maximum throughput. Screenshots of "no antenna at all" and "new antenna". I didn't turn on the "old antenna" as the new one is identical. TL; DR - If your current antennas are working well, don't worry about upgrading. - If you have something <1-3 dBi, maybe upgrade to that. - Measure twice, cut once.
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