This paper presents a full duplex radio design using signal inversion and adaptive cancellation, along with a full duplex medium access control (MAC) protocol. The design uses a balun (balanced/unbalanced) transformer to invert signals, enabling wideband and high power operation without bandwidth constraints. The balun-based design requires only two antennas and automatically tunes to cancel self-interference. Combined with digital cancellation, the system can achieve up to 73dB of self-interference cancellation, enabling full duplex 802.11n devices with reasonable antenna separation. The full duplex MAC protocol reduces packet losses due to hidden terminals by up to 88% and improves network fairness from 0.85 to 0.98 while increasing downlink and uplink throughput by 110% and 15%, respectively. The design is evaluated using a 5-node WARP software radio testbed, demonstrating significant improvements in network performance. The paper also addresses the limitations of existing full duplex designs, such as bandwidth constraints, the need for three antennas, and manual tuning. The proposed balun cancellation design overcomes these limitations by using passive components and automatic tuning, achieving better cancellation performance than previous methods. The results show that a redesigned wireless network stack can significantly improve network performance by exploiting full duplex capabilities.This paper presents a full duplex radio design using signal inversion and adaptive cancellation, along with a full duplex medium access control (MAC) protocol. The design uses a balun (balanced/unbalanced) transformer to invert signals, enabling wideband and high power operation without bandwidth constraints. The balun-based design requires only two antennas and automatically tunes to cancel self-interference. Combined with digital cancellation, the system can achieve up to 73dB of self-interference cancellation, enabling full duplex 802.11n devices with reasonable antenna separation. The full duplex MAC protocol reduces packet losses due to hidden terminals by up to 88% and improves network fairness from 0.85 to 0.98 while increasing downlink and uplink throughput by 110% and 15%, respectively. The design is evaluated using a 5-node WARP software radio testbed, demonstrating significant improvements in network performance. The paper also addresses the limitations of existing full duplex designs, such as bandwidth constraints, the need for three antennas, and manual tuning. The proposed balun cancellation design overcomes these limitations by using passive components and automatic tuning, achieving better cancellation performance than previous methods. The results show that a redesigned wireless network stack can significantly improve network performance by exploiting full duplex capabilities.