What nobody realizes, unless you are from the CATV industry, is that there are specific connectors as well as crimping tools for each cable and I don't mean all RG-6. Most of the time I see complete abortions when connectors are installed. Looks like they were smashed with a hammer or channel locks! They also have no idea how to prepare the cable for the connector either. If connectors are not installed properly it may flat out not work, there will be intermittant as well cause ingress and radiation problems.
The cable manufacturer may have a recommendation for the proper connector but it may not be something that you are going to be able to find. Supply houses understandably have no clue because this is not an electrical item. Connectors are available from CATV supply outfits like Arris Telewire but you have to have a part number.
This is one reason for using the right cable for the job. If you can't get the proper connector and don't have the proper tool it defeats the purpose. Why the heck are you using that quad shield stuff anyway?? Do you have ingress problems?
-Hal
