Try this
SELECT strTitle AS 'TITLE', txtContent AS 'Content', 'tblContent' AS 'From'
UNION
SELECT news_title AS 'TITLE', news_content AS 'Content', 'tblNews' AS 'From'
UNION
SELECT company_title AS 'TITLE', company_content AS 'Content', 'tblTradeMembers' AS 'From'
This will club all the records in your view