Linksys WRT54G with Cisco Aironet antennas

Hi Cisco users,
I've got a small project:
I need to provide a wireless network from a farmhous to a piggery:
Distance about 40 metres, no obstructions
Equipment:     Linksys WRT54G v3.1
When i place the wrt54g to the most far point of the house (towards the piggery) i get a fairly stable signal of around 11Mbps
I want to strengthen the signal via an external antenna, preferrably outdoor.
i'm thinking of this antenna:
Cisco Aironet 8.5-dBi Patch Antenna (AIR-ANT2485P-R)
http://www.cisco.com/en/US/docs/wireless/antenna/installation/guide/ant2485.html
or the same one as above only with 6 dBi.
http://www.cisco.com/en/US/docs/wireless/antenna/installation/guide/ant2460.html
Both the linksys and cisco aironet antenna's has RP-TNC connectors.
My questions:
1: Can cisco aironet antenna's work with a linksys wrt54G, based on the same connectors.
2: Is the antenna strong enough? can i cover a distance of 40/50 meters with this antenna, or with the 6dBi version?
3: it's a directional antenna. the piggery is straigh ahead of the farm house. How much beam width do i have on the end of the signal for coverage?
4: maybe i need an extension cable. is this the right one?
Cisco Aironet 5-ft, low-loss, 2.4-GHz RF cable with RP-TNC connectors (AIR-CAB005LL-R)
http://www.comegacity.com/networking-wireless-b-bn/antennas-cables/cisco-air-cab005ll-r-aironet-5-low-loss-cable
Thanks in advance.

The connector has to be the same but also the impedance. Cisco APs are at 50 ohms. Not sure about linksys ...
Otherwise if you put the antenna outdoor and there is no obstacle, 40/50m should be reached with those antennas. Take the lowest length of cable possible to put the antenna outdoor though as cable brings loss.
I can't comment about if the 6dbi will be enough as this would require experience with the same hardware which I don't have.
My 2 cents
===
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