https://www.ebay.com/itm/124586893571 https://www.amazon.com/dp/B0130NB598?psc=1&ref=ppx_yo2_dt_b_product_details Please note this only works on a subset of frequencies. I had forgotten he did an RF survey and did the ideal freqs and channels for his location and bought specifically for them. But, this should point you in the general direction. $120 isn't bad. Speaking of pointing, the provided whip antenna is so so, so he bought a nice omnidirectional. Iirc, gave another bar inside. Also note, the yaggi is a directional antenna. You point it at the desired tower. Though you can certainly look at other options. Regardless, you can see you don't have to spend a ton to drastically improve things. My brother went from zero bars to crystal clear calls and internet service.