Weak wifi signal with Lion

dear all,
have been experimenting problems wireless connection 2 months, since have passed osx lion.
have been searching feedbacks same problems on web , on forum. seems me many people have experimented "constantly dropping wifi" since have passed lion.
not case, however: problem that, lion, signal of wifi very weaker (in terms of dbm) respect same signal registered mac snow leopard (and windows , androids). make example, 4 meters away router signal -50 if seen on pc, -80 if seen mac (with constant noise of -96). not normal.
did not succeed in finding solutions, since problems dropping wifi seem obscure in sense problem , not know can do. of course, down-grade snow leopard, paid lion , many reasons, wondering if there solutions.
sorry if else has asked same assistance , has not been able find discussion out.
of course, thank in advance help.

here details on hardware-software , attempts have performed.
have macbook 13,3 2,16 ghz intel core 2 duo, late 2007 (a1181).
software mac os x lion 10.7.3 (11d50b)

attempts: looking solutions on web, have performed following tasks:
- update software
- reset router
- reset wireless card
- reset pram
- reset smc
- delete airport passwords , profiles
- create connectivity profile
- rename wifi
- try other wifis
- change channels on router
- change router
- put "wi-fi" on top of column in preferred network window
- install native copy of snow leopard (the signal normal, id est windows gains)
- install native copy of lion (the signal bad, problem lion, not "my system lion")
- set mtu manually 1492
- recover io80211family.kext old (working) backup of snow leopard, install kext wizard, repair permissions , rebuilding kext cache. not working.

that's all, folks.
thank you!

 

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