Hi snowhntr2,

Welcome to Dell community.

DELL™ LATITUDE™ E6520 offers with the following wireless card option.

Wireless LAN and WiMAX Options:
Intel® Centrino® Advanced-N 6205, Intel® Centrino® Advanced-N + WiMAX 625013; Intel®
Centrino® Ultimate-N 6300; Dell Wireless 1501 (802.11 b/g/n 1x1); Dell Wireless 1530
(802.11 a/g/n 2x2)

To answer your question yes, you can upgrade the wireless card to Intel Centrino Intel 6235/6300/6250/6205/6200.

For more information on the wireless card you can refer this article http://dell.to/1AnVRaM 

Hope this helps.