One Year Old MacBook Doesn't See 5GHz Time Capsule

My son's MacBook (13" 2.4GHz Core 2 Duo, Machine ID MacBook4,1, running Mac OS X 10.5.7) seems to be unable to connect to my first-generation Time Capsule that is configured to operate over 802.11n on the 5GHz band (the 2.4GHz band is very crowded here).
His MacBook has a AirPort Extreme (0x14E4, 0x88) card by Broadcom (firmware BCM43xx 1.0 5.10.38.35) -- the same version of firmware I have on my MacBook Pro (which has no difficulty making the connection).
Question: Shouldn't that generation MacBook work with the 5GHz 802.11n TC?
Does anyone have an idea as to why it isn't working and/or a suggestion what to do about it? Are there specific frequencies or channels to be avoided (I use Automatic, but that was by default).
Thank you.

Thanks forks for the posts. To reply to your questions in order:
GD, the Time Capsule does put out 5GHz -- and it is currently configured to "5GHz (only)" mode.
BT, the password is unmodified, the MacBook has been power cycled (as has AirPort) on numerous occasions. The network is currently configured as "Closed," though that can (and will) be toggled for testing purposes. I'll let you know.
I will also try setting the frequency manually (on a high channel, then a low one, etc.) instead of using "Automatic." I learned, from related reading, that some 802.11n radios cannot acquire all the specified frequencies, so maybe "Automatic" landed on one that this MacBook can't deal with.
I'll report back on the outcome of testing later today.
Again, thank you.

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