Hello friend,
is possible when this week to make new link 21km with 2.4ghz, how is your suggesstion come, please…
MT [AP-Bridge] RB532 + Grid Antenna 24dbi >>>>> MT [Station] RB511 + grid Antenna and LOS
I need your suggestion and XPeriences, and How much troughput you have
From GPS report:
we have AP 220meters and next station at 872meters from sea level, and 21km between them..!!!
Thanks for your time… 
I’ve a 12km link, 22dbi grid each end poor LOS (a tree on end) and get 6mbps through the link, set to
2 R ;;; NET-EL-NMP-8602 - 12km Link
name="wlan3" mtu=1500 mac-address=00:02:6F:42:30:60 arp=enabled
disable-running-check=no interface-type=Atheros AR5413
radio-name="WHH-WLAN3" mode=ap-bridge ssid="SVWxyz" area=""
frequency-mode=manual-txpower country=bla antenna-gain=0
frequency=2472 band=2ghz-10mhz scan-list=default rate-set=configured
supported-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps
supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps
basic-rates-b=1Mbps basic-rates-a/g=6Mbps max-station-count=2007
ack-timeout=dynamic tx-power=26 tx-power-mode=card-rates
noise-floor-threshold=default periodic-calibration=enabled
periodic-calibration-interval=60 burst-time=disabled dfs-mode=none
antenna-mode=ant-a wds-mode=disabled wds-default-bridge=none
wds-default-cost=100 wds-cost-range=50-150 wds-ignore-ssid=no
update-stats-interval=disabled default-authentication=yes
default-forwarding=yes default-ap-tx-limit=0 default-client-tx-limit=0
proprietary-extensions=post-2.9.25 hide-ssid=yes
security-profile=default disconnect-timeout=3s on-fail-retry-time=100ms
preamble-mode=both compression=no allow-sharedkey=no
it works OK but I’m wanting to cut down the tree and maybe use more powerful (SR2) cards.
… copper nails …
[honestly never done it, but gather it works -]
Last time I had the problem I found my chainsaw a very effective solution, unfortunately the owner of the tree also lets me have the repeater on their garage… Now if I could bolt a white plastic box and parabolic to the chimney of their 16th Century house the tree would no longer be in the way
Why not put up your own tree 
http://my.core.com/~lbutler/Tree1.JPG
static.flickr.com/6/5449173_8cb6b06012_m.jpg
http://www.scotland.gov.uk/Resource/Img/1103/0006644.jpg
and some nice examples of concealed antennas and masts in this planning document
http://www.scotland.gov.uk/Publications/2001/09/pan62
the cellphone industry has being doing this for years …
Great links, will be handy if we ever get our church antenna permission.