Which antenna for Boscam 32Ch 5.8G 600mw tx / Boscom TS832 Rx

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Just picked up the Boscam 32Ch 5.8G 600mw 5km Wireless AV Transmitter TS832 Receiver RC832 pair from ebay. $75 shipped for free form the US.

They take a RP-SMA antenna. What is a good bang for the buck antenna set that works well?

Immersion antennas run into the $60.00 / set...

Boscam 5.8GHz Cloud Spirit Circular Polarized Antenna Set RP-SMA are about $25.00 / set

 

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I went with the Boscam 5.8GHz Cloud Spirit Circular Polarized Antenna Set RP-SMA f FPV Aerial US from ebay.