This was a weird one. Every device in my house was ok with my AP broadcasting over channel 11, but fedora 20 with BCM4352, installed using "yum install kmod-wl" from the rpmfusion repositories, had very erratic behaviour.
Someone in a forum had asked a person with a similar problem to show what channel they were using, and it made me check my home settings. I tested and was able to connect satisfactorily to another wifi network, which was on channel 01. I switched my AP's radio from channel 11 to channel 1, and it's been working perfectly now.
A command to display what channel is being used is
$ iwlist wlp3s0 freq
wlp3s0 26 channels in total; available frequencies :
Channel 01 : 2.412 GHz
Channel 02 : 2.417 GHz
Channel 03 : 2.422 GHz
Channel 04 : 2.427 GHz
Channel 05 : 2.432 GHz
Channel 06 : 2.437 GHz
Channel 07 : 2.442 GHz
Channel 08 : 2.447 GHz
Channel 09 : 2.452 GHz
Channel 10 : 2.457 GHz
Channel 11 : 2.462 GHz
Channel 12 : 2.467 GHz
Channel 13 : 2.472 GHz
Channel 14 : 2.484 GHz
Channel 36 : 5.18 GHz
Channel 38 : 5.19 GHz
Channel 40 : 5.2 GHz
Channel 42 : 5.21 GHz
Channel 44 : 5.22 GHz
Channel 46 : 5.23 GHz
Channel 48 : 5.24 GHz
Channel 149 : 5.745 GHz
Channel 153 : 5.765 GHz
Channel 157 : 5.785 GHz
Channel 161 : 5.805 GHz
Channel 165 : 5.825 GHz
Current Frequency:2.412 GHz (Channel 1)
where wlp3s0 is your interface. you can use tab to fill it in, or get the name from ifconfig
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