Overriding Airport Country Code

I own a Macbook Pro that originally came with an 802.11 b/g card only. Being out of warrantee I upgraded the internal Airport card to one that supports 802.11 a/b/g/n. Unfortunately it is unable to connect to my router when it is set to 802.11n on channel 149 (5 Ghz set of channels).

Looking at system profiler, I see the following in the airport section:
Software Versions:
Menu Extra: 6.0 (600.22)
configd plug-in: 6.1 (610.2)
System Profiler: 6.0 (600.9)
Network Preference: 6.0 (600.22)
AirPort Utility: 5.4.2 (542.23)
IO80211 Family: 3.1 (310.6)
Interfaces:
en1:
Card Type: AirPort Extreme (0x168C, 0x1026)
Firmware Version: Atheros 5416: 2.0.19.4
Locale: Unknown
Country Code: JP
Supported PHY Modes: 802.11 a/b/g/n
Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
Status: Connected
Current Network Information:

I don't live in Japan. I live in the US, so the country code isn't being set correctly. Looking on the forums I see that 802.11d beacons could be setting my country code incorrectly. However, I don't think that is the case since there is nothing in my system log saying that it received an 802.11d beacon and I took my laptop to another neighborhood to see if the country code is updated. From my logs:

bash-3.2# grep en1 /var/log/system.log /var/log/kernel.log | grep -v "Link" | grep -v "handshake"
bash-3.2#

The grep -v's remove the RSN handshake and the Link status change lines from the logs.

My question... Is there any way to override the Country Code in Snow Leopard manually?

More info about my system:
Hardware Overview:

Model Name: MacBook Pro
Model Identifier: MacBookPro1,1
Processor Name: Intel Core Duo
Processor Speed: 2.16 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 2 MB
Memory: 2 GB
Bus Speed: 667 MHz
Boot ROM Version: MBP11.0055.B08
SMC Version (system): 1.2f10
Serial Number (system): <snip>
Hardware UUID: <snip>
Sudden Motion Sensor:
State: Enabled

Thanks in advance,
Scott