TomatoUSB

I see lots of antennae that are rated for 2.4Ghz 802.11b/g but no mention of support for n.

I saw this on ebay (will it work?):

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<a href="http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250523672562&ssPageName=STRK:MEWAX:IT">9db external antenna"</a>
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I like the magnetic base, and am looking for that (mount the antenna up high away from the router).

Have an Asus RT N16 so it is 2.4Ghz only; I use mixed g/n.

Yes they will work.

I recently upgraded the 2dBi stock antennae with these:

If you plan to use magnetic base to mount the antenna elsewhere, there will be some signal loss from the pigtail and the base itself. Use a slightly higher dBi antenna to compensate for the signal loss.

Any recommendations for the following scenarios?

Its because we dont get strong signal on the other level of the Condo due to Steel reinforced Concrete in middle. I am going to try increasing Power using Tomato software, but its genuine concrete caused wi fi signal attenuation.

OPTIONS:

- Replacing ONE or MORE or ALL the Antennas with bigger antenna more DBi?

AND/ OR

- Only replacing ONE Antenna with a CABLE extension and Antenna on different floor of 2 level Condo (Which has RCC - Reinforced Concrete in between the 2 levels. )

AND/ OR

- Just finding a "Good Quality" dependable cable (2/3 metres) that will not have a major Gain drop. (This seems the simplest & gets signal to avoid going through the Concrete). Any dependeable extension cables?

Please recommend for above scenarios?