It rather narrow banded with about 50 kHz around the center frequency that is below 2:1 SWR. The dip at 1820kHz.
It uses the same radial field as shown below.
On air results are QSOs with stations in the PA QSO party, W1AW/4 portable and friends N4IQ and N0TR.
It probably could be more efficient. My input impedance is right at 52 ohms indicating that I need more radials. On 80m it is efficient enough to have gotten me close to DXCC - 95 confirmed.