Why the poor wifi performance on iPhone 5

I am using my iPhone 5 and five feet away my wife has her new iPad. Both on the same wifi. The iPad is showing three bars but the iPhone 5 goes from two to none. It sometimes looses all wifi signal and drops off to cellular. I thought one of the recent upgrades to the iOS was supposed to fix wifi reception problems on the iPhone 5.
Any solutions?

Some added info for my question. We have an Airport Extreme on our computer and an Airport Express in the area where we sit to improve the signal. My wife's iPad is about six feet away from the Express; I am about two feet. Her signal has to go through me so I think the iPhone reception should be stronger.

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I've been doing periodic bandwidth tests with speedtest.net for several years now. I have an account, so my results are saved. I do them from a Mac Mini and also from my iPad.
The MacMini is hardwired to an Airport Extreme. The iPad is, of course, using WiFi. Usually it is on the 5GHz network, but sometimes (I have no idea why) it selects the 2.4GHz network. The 5GHz network is "n only", the 2.4GHz network is b/g/n. Security is WPA/WPA Personal. The Airport Extreme is on firmware 7.6.1. (I rolled back in December, a couple of months after I noticed the degraded WiFi performance.)
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So, what did I do to mess up the WiFi on my Airport Extreme?

Thanks.
Model is A1408.
I set the 2.4GHz network to channel 8.
I had to leave the 5GHz network to "Automatic" because choosing 36, 40 or 44 prevented both of my Airport Expresses from connecting. They would only connect with "Automatic".
All the names are alphanumeric and short: mgn, mgn5ghz, AirEx, etc.
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# --- Check Connectivity
# --- Wi-Fi Interface
          Interface Name                    : en1
          MAC Address                    : 00:24:36:f0:a9:33
          Network Name                    : mgn
          Active PHY Mode                    : 802.11n
          Security                    : WPA2 Personal
          SSID                    : mgn
          BSSID                    : b8:8d:12:63:32:8d
          Country                    : TH
          RSSI                    : -51 dBm
          Noise                    : -89 dBm
          Rate                    : 130 Mbps
          Channel                    : 8
          Channel Width                    : 20MHz
# --- Bluetooth
          Power State                    : On
          Paired Devices                    : 0
# --- Wireless Environment
          2.4 GHz Networks          : 2
          5 GHz Networks                    : 2
          Current Channel Networks          : 2
          Recommended 2.4GHz Channels          : [ 11 6 1 2 3 4 5 7 9 10 12 13 ] 8
          Recommended 5GHz Channels          : [ 36 40 44 48 153 157 161 165 ] 149
# --- Network Configuration
          Primary IPv4 Interface          : en1
          IPv4 Address                    : 192.168.0.76
          IPv4 Router                    : 192.168.0.1
          Primary IPv6 Interface          : None
          IPv6 Address                    : None
          IPv6 Router                    : None
          DNS Servers                    : 192.168.0.1
                                          8.8.8.8
                                          8.8.4.4
# --- Debug Log Entries
01/20/14 16:48:29.6470           Large preferred networks list count <31>
01/20/14 16:48:43.2710           SMTP port check time out
01/20/14 16:48:43.2760           Current Wi-Fi network is an AirPort network

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PING 192.168.0.2 (192.168.0.2): 56 data bytes
64 bytes from 192.168.0.2: icmp_seq=0 ttl=64 time=1.765 ms
64 bytes from 192.168.0.2: icmp_seq=1 ttl=64 time=0.787 ms
64 bytes from 192.168.0.2: icmp_seq=2 ttl=64 time=0.765 ms
64 bytes from 192.168.0.2: icmp_seq=3 ttl=64 time=0.888 ms
64 bytes from 192.168.0.2: icmp_seq=4 ttl=64 time=0.862 ms
64 bytes from 192.168.0.2: icmp_seq=5 ttl=64 time=0.911 ms
64 bytes from 192.168.0.2: icmp_seq=6 ttl=64 time=1.197 ms
^C
--- 192.168.0.2 ping statistics ---
7 packets transmitted, 7 packets received, 0% packet loss
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imac1-sant:~ steves$ ping 192.168.0.11
PING 192.168.0.11 (192.168.0.11): 56 data bytes
64 bytes from 192.168.0.11: icmp_seq=0 ttl=64 time=667.107 ms
64 bytes from 192.168.0.11: icmp_seq=1 ttl=64 time=180.341 ms
64 bytes from 192.168.0.11: icmp_seq=2 ttl=64 time=99.633 ms
64 bytes from 192.168.0.11: icmp_seq=3 ttl=64 time=22.600 ms
64 bytes from 192.168.0.11: icmp_seq=4 ttl=64 time=250.583 ms
64 bytes from 192.168.0.11: icmp_seq=5 ttl=64 time=173.842 ms
64 bytes from 192.168.0.11: icmp_seq=6 ttl=64 time=96.888 ms

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Reply from 192.168.0.111: bytes=32 time=7ms TTL=64
Reply from 192.168.0.111: bytes=32 time=6ms TTL=64
Reply from 192.168.0.111: bytes=32 time=2ms TTL=64
Reply from 192.168.0.111: bytes=32 time=2ms TTL=64
Reply from 192.168.0.111: bytes=32 time=3ms TTL=64
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Request timed out.
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Message was edited by: J_Walker

Ok now im in leopard i need to use the new 'network utility' but anyway heres the results of pinging my touch:
PING 10.0.1.197 (10.0.1.197): 56 data bytes
64 bytes from 10.0.1.197: icmp_seq=0 ttl=64 time=445.006 ms
64 bytes from 10.0.1.197: icmp_seq=1 ttl=64 time=158.470 ms
64 bytes from 10.0.1.197: icmp_seq=2 ttl=64 time=182.414 ms
64 bytes from 10.0.1.197: icmp_seq=3 ttl=64 time=513.655 ms
64 bytes from 10.0.1.197: icmp_seq=4 ttl=64 time=231.859 ms
64 bytes from 10.0.1.197: icmp_seq=5 ttl=64 time=49.459 ms
64 bytes from 10.0.1.197: icmp_seq=6 ttl=64 time=73.446 ms
64 bytes from 10.0.1.197: icmp_seq=7 ttl=64 time=404.536 ms
64 bytes from 10.0.1.197: icmp_seq=8 ttl=64 time=121.158 ms
64 bytes from 10.0.1.197: icmp_seq=9 ttl=64 time=43.599 ms
--- 10.0.1.197 ping statistics ---
10 packets transmitted, 10 packets received, 0% packet loss
round-trip min/avg/max/stddev = 43.599/222.360/513.655/163.599 ms
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