Mountain Lion and Lion wifi issues

Don't start on me about there being multiple threads on that subject already.  I was told by a very respected member of these forums to start my own thread on the issue.
Dropping wifi started with Lion and for the last 10 months with ML.  I've been in touch with Apple, they called me after reading my old post and had me run test for them with no help.  I've done completely clean installs on newly reformatted hard drive and using a USB drive to install ML.  It won't connect to wifi to finish install half the time so other software isn't the issue.
I've tried just about every fix posted.  A lot of them with Apple on the phone.  I've replaced my router knowing that wouldn't fix it because I take my Mac with me and it drops wifi on any router or network.
I have 2 Macs and only one has ever had this issue.
You don't have to believe I've tried everything, that I've had Apple call me or that I even have the issue.
I've been asked to post the names of the engineers that have contacted me.  Why would you need to know that in order to believe me, especially if you admit to not knowing any. 
All I want to know is there a fix?  Yes/No
Remember it doesn't want to connect on a clean install.
P.S.:
For all those looking for reason's not to help me, my dog is yawning in the picture not growling.  Yes I've gotten mad on other threads but how many times can you be called a liar just because their fixes didn't work for me or I won't post engineers names. 

Thanks for that list.
Out of all you posted I tried everything with Apple on the phone. 
I'm the only one who uses this Mac and I constantly check my settings incase something was changed on it's own because of some app.  But I'll lock it after retrying everything over again.
I'll be glad to get it down to once every few days again. I haven't complaned about it in a long time because I could live with that.  That's where I was before it went back to dropping constantly. Lets face it once a day would be great.  I've had to reboot just trying to reply. 
I've started taking some live on line courses so it's not just an announce to me.  It started again before I started classes.
The 10.8.3 update made it worse.  But not enough to go back to 10.8.2. 
My mail program is affected the worst.  When wifi drops and Mail is running I always have to force quit.  I know that's an affect no the cause.
I do have another Genius Bar appointment for that and a couple of other issues.  The first time they denied there were any wifi issues until I gave them the names of the engineers that called me with their email addresses and phone numbers.  I've since lost their phone numbers but still have their email addresses.  I know one was a CA area code and the Main one was from TX.  I have emailed them this week but still no reply.
Like I said once it went down to dropping every few days I didn't care any more.
I'll keep you up to date.

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