X500 Bt Hifi Lossless Audio Receiver Bt4.0 Chip External Omnidirectional Antenna Support Aac/mp3/sbc Decoding Gold Us Plug | Fruugo NO
DroneAnt-Plus for Syma X500 Pro with X500 Pro Range Extender Antenna| SohoBoost
DroneAnt-Ref for Syma X500 Pro for X500 Pro Antenna| SohoBoost
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MEDIACOM ANTENNA GPS X500, M-1GPSX500 RICAMBIO ORIGINALE, NUOVO | eBay
Fixing a Diamond X-500 2/70 antenna – VK4GHZ.com
WB4IUY's Random Blog: Rebuilding the old Diamond X-500 Antenna...