Slow wifi on mac book air.. is this normal? (airdrop)

when using airdrop to send from mac book air (11 inch mid 2011) to a mac book pro (13 inch mid 2011) the wifi airdrop transfers seem very slow. a 5 gig file took 30 minutes to airdrop. when i was at my brothers house and i sent 11 gigs to his imac (unsure which model maybe 2009 <- before thunderbolt) it took 3 hours.
i thought maybe this was airdrops fault, so i connected this mac book air to my mac mini (mid 2010) using airdrop, it also took 30 minutes for 5 gigs.
so i made a manual WEP adhoc connection on channel 48, it also took 30 minutes for 5 gigs. i then tried copying files from another laptop (a dell)
and the 5 gig file copied at the full 300 mbps (or abouts) maybe 5 minutes to the macmini
whats going on here??? is this normal for the mac book air?? do i have a bum wireless card?? i was going to ask a genius to switch out the wifi card or check the antennas but i thought i would post here to see if anyone else has problems
when copying to the mac book pro or the imac i made sure that both computers were connected at 2.4 to different networks, to make sure that 2.4 was
tied up, figuring the simulataneous airdrop connection would prefer 5 ghz. ive seen it sometimes airdrop on the same machines on the same network and taking longer because it was a 802.11g network.

seems like any of the 2 computers on at 2.4 ghz (even on different networks) slows down airdrop. but havingboth computers wifi cards on but not connected to anybody, speeds up airdrop dramatically.
sending from air to mini (air = 5 ghz wifi) mini (2.4 wifi) airdrop speed 12 gigs in 1 hour
sending from air to mini (air = 5 ghz wifi) mini (not connected) air drop speed 12 gigs less then 30 minutes
sending from air to mini (both at 2.4 ghz) 4 hours
sending from air to imac (both at 2.4 ghz on two different networks ) 4 hours

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Problem description:
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Report generated October 27, 2014 at 4:54:51 PM EDT
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MacBook Air (13-inch, Mid 2011) (Verified)
MacBook Air - model: MacBookAir4,2
1 1.8 GHz Intel Core i7 CPU: 2-core
4 GB RAM Not upgradeable
BANK 0/DIMM0
2 GB DDR3 1333 MHz ok
BANK 1/DIMM0
2 GB DDR3 1333 MHz ok
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en0: 802.11 a/b/g/n
Video Information: ℹ️
Intel HD Graphics 3000 - VRAM: 384 MB
Color LCD 1440 x 900
System Software: ℹ️
OS X 10.10 (14A389) - Uptime: 0:15:56
Disk Information: ℹ️
APPLE SSD SM256C disk0 : (251 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
Macintosh HD (disk1) / [Startup]: 249.77 GB (20.55 GB free)
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Apple Inc. FaceTime Camera (Built-in)
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Apple Internal Memory Card Reader
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Apple Inc. thunderbolt_bus
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Mac App Store and identified developers
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[loaded] com.google.keystone.agent.plist Support
[loaded] com.oracle.java.Java-Updater.plist Support
[running] com.wyse.MacCompanion.plist Support
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[loaded] com.adobe.fpsaud.plist Support
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iTunesHelper ApplicationHidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
ScanSnap Manager ApplicationHidden (/Applications/ScanSnap/ScanSnap Manager.app)
Spotify UNKNOWNHidden (missing value)
Dropbox Application (/Applications/Dropbox.app)
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FlashPlayer-10.6: Version: 15.0.0.189 - SDK 10.6 Support
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AdobePDFViewerNPAPI: Version: 11.0.02 - SDK 10.6 Support
AdobePDFViewer: Version: 9.0.0 Support
Flash Player: Version: 15.0.0.189 - SDK 10.6 Support
o1dbrowserplugin: Version: 5.4.2.18903 Support
OfficeLiveBrowserPlugin: Version: 12.3.6 Support
QuickTime Plugin: Version: 7.7.3
googletalkbrowserplugin: Version: 5.4.2.18903 Support
Silverlight: Version: 5.1.10411.0 - SDK 10.6 Support
JavaAppletPlugin: Version: Java 7 Update 65 Check version
User Internet Plug-ins: ℹ️
Google Earth Web Plug-in: Version: 7.1 Support
Safari Extensions: ℹ️
OpenIE
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Flash Player Support
Java Support
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Time Machine not configured!
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94 MB Dropbox
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