Max distance that a wireless care can transfer
What is the max distance that a wireless card can transfer in meter?
That depends on a great many factors. What type of wireless? 802.11a?b?g?n? What kind of antennas are involved? What kind of legal/illegal amplification are you intending to use? In general, the longer the range, the slower the transfer. So technically, you may ultimately be able to initiate a connection over an extremely long distance, but the transfer rate will be so slow as to be totally unusuable.
The atheros chipset has a max ack/cts timer setting that will allow about 230km.
The setting util in pfsense will allow for about 40km max. But that calc is not accurate.