Antibodies stored in freezer instead of fridge
Most IgGs should be fine when stored in the freezer.


  Freezing at -20 or -80 in small aliquots is the optimal storage
  condition. Ali-quoting minimizes damage due to freezing and thawing,
  as well as contamination introduced by pipetting from a single vial
  multiple times. Aliquots are to be frozen and thawed once, with any
  remainder kept at 4 degrees C.
  
  Enzyme-conjugated antibodies, should not be frozen at all and should
  instead be kept at 4 degrees C. Freezing and thawing will reduce
  enzymatic activity in addition to affecting the antibody binding
  capacity. 
  
  Antibodies of the IgG3 isotype are unique in their tendency to form
  aggregates upon thawing and should always be stored at 4 degrees C


Personally, I store antibodies I use at -20 (they are in PBS), and they work fine for the first freeze thaw cycle. I have never tried more than one freeze thaw, so cant comment on that.

http://www.abcam.com/ps/pdf/protocols/antibody_storage.pdf