The CC2530 chip used in the ZBR3s have a typical output power of 4.5dBm, the HE C5 hub is using a chip which has typical output power of 8dBm. In comparison, the IKEA Repeaters use a chip (ERF32MG1P) with 14 dBm output power. If CC2530 is paired with a CC2591 power amplifier you end up with a dBm around 20. This is the maximum allowed for channels 11 to 24. For 25, 26 it is a bit lower.
With an antenna you get somewhat better performance on a CC2530 without a PA, but it is more an improvement on receiving sensitivity than sending in my experience. It is a great way to make a CC2530-based Zigbee sniffer more reliable in receiving all packets. See this thread for some more information.
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