Broadband, untuned RF preamp. 50 ohm input, 50 ohm output. THIS one is your best buy! Excellent noise figure, gain and frequency coverage at a BUDGET PRICE. Up to 18.5 dB gain at 100 MHz. 17 dB gain typical at 500 MHz. Supply voltage: 8-14 VDC. We recommend (undrilled, no holes) enclosure TPx-13 for this item. Order TP-13 for unpainted aluminum, TPB-13 for black, TPC-13 for charcoal. See bottom of page to add enclosure to cart.