Are you wanting to extend the range? Wireless access points/repeaters tend to be better, and a Wireless N one is less than R500.
These are within your budget and are available from most online shops.
D-Link ANT24-0700C 2.4Ghz 7dBi omni-directional antenna , bean width - H:360° V:24° - RP-SMA or RP-TNC
http://www.dlink-africa.com/products/?pid=467
D-Link ANT24-0700 2.4Ghz 7dBi omni-directional antenna , bean width - H:360° V:24° - include 1.5m extensionn cable , SMA or TNC , with stand for desktop , wall mounting via screw or magentic
http://www.dlink.com/products/?pid=ANT24-0700
D-Link ANT24-0800 2.4Ghz 8dBi indoor/outdoor omni-directional antenna , bean width - H:360° V:15° , ideal for PtMP ( Point to Multi-Point ) , water proof for outdoor applications , SMA or TNC
http://www.dlink-africa.com/products/?pid=52
D-Link ANT24-1200 2.4Ghz 12dBi indoor high gain directional panel , bean width - H:80° V:23° , wall or window mounting. SMA
http://www.dlink.com.au/products/?pid=ANT24-1200
D-Link ANT24-1201 2.4Ghz 12dBi indoor/outdoor directional yagi high gain pico cell patch antenna , swivel mount for directional orientation , bean width - H:50° V:50° , swivel mount for directional orientation , weatherproof & corrosion resistant , N-female+SMA
http://www.dlink.co.uk/cs/Satellite...95806691854&pagename=DLinkEurope-GB/DLWrapper
