how to make a cb antenna

{"cid":"91201209","title":"High Performance Omni directional 915mhz Antenna 4*4 Aftermarket Truck Antenna","imgUrl":"https:\/\/img.chinax.com\/nimg\/6d\/e9\/33e8192a7f9c6685d0c290f9b30f-200x200-1.jpg","attrs":{"Price":"$9.00\/Pieces 100-499 Pieces","Brand Name":"Baiao","Model Number":"BIO-C872","Minimum Order Quantity":"100 Pieces","Delivery Time":"5-8 wrok days","Place of Origin":"Guangdong, China","Packaging Details":"head card+ PE bag, outer carton","Supply Ability":"100000 Piece\/Pieces per Month","Payment Terms":"TT","Certification":"CE IOS ROHS SGS","Car Make":"trucks, cars","Frequence Range":"26-28MHz","Gain(dB)":"0-1dBi","Cable Length":"790mm","Product name":"radio antenna for car","Frequency":"26~28MHz","V.S.W.R":"1.5:1 Max","Impedance":"50 Ohm","Radiation Pattern":"Omni-directional","Polarization":"Linear Vertical","Max Power":"300W","Cable":"RG58","Connector":"UHF (M) (Optional)","Size":"Dia78*790mm","Port":"Dongguan"}}

{"cid":"91179301","title":"Heavy Duty 4X4 Truck Push Bar 3 - 4 Mm Thick Steel For Toyota Land Cruiser","imgUrl":"https:\/\/img.chinax.com\/nimg\/15\/21\/4b09c093bc4cb75b9f3a2f27931b-200x200-1.jpg","attrs":{"Price":"Negotiation","Brand Name":"GZDL4WD","Model Number":"DL-FB-3B","Minimum Order Quantity":"5 sets","Delivery Time":"5-45 days","Place of Origin":"Guangzhou,China","Payment Terms":"T\/T, Western Union,PayPal","Supply Ability":"500 sets per month","Packaging Details":"Neutral Packing","Material":"Rolled Steel","Color":"Black","Position":"Front","Type":"Front Bumper \/ Bull Bar","More Design":"Toyota Land Cruiser FJ80,FJ90,FJ100,FJ120"}}